| 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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| 2 | <html>
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| 3 | <head>
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| 4 | <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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| 5 | <title>Links and flowing text</title>
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| 6 | <link type="text/css" rel="stylesheet" href="../fpdf.css">
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| 7 | </head>
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| 8 | <body>
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| 9 | <h1>Links and flowing text</h1>
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| 10 | This tutorial explains how to insert links (internal and external) and shows a new text writing
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| 11 | mode. It also contains a basic HTML parser.
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| 12 | <div class="source">
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| 13 | <pre><code><?php
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| 14 | <span class="kw">require(</span><span class="str">'fpdf.php'</span><span class="kw">);
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| 15 |
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| 16 | class </span>PDF <span class="kw">extends </span>FPDF
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| 17 | <span class="kw">{
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| 18 | var </span>$B<span class="kw">;
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| 19 | var </span>$I<span class="kw">;
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| 20 | var </span>$U<span class="kw">;
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| 21 | var </span>$HREF<span class="kw">;
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| 22 |
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| 23 | function </span>PDF<span class="kw">(</span>$orientation<span class="kw">=</span><span class="str">'P'</span><span class="kw">, </span>$unit<span class="kw">=</span><span class="str">'mm'</span><span class="kw">, </span>$size<span class="kw">=</span><span class="str">'A4'</span><span class="kw">)
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| 24 | {
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| 25 | </span><span class="cmt">// Call parent constructor
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| 26 | </span>$<span class="kw">this-></span>FPDF<span class="kw">(</span>$orientation<span class="kw">,</span>$unit<span class="kw">,</span>$size<span class="kw">);
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| 27 | </span><span class="cmt">// Initialization
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| 28 | </span>$<span class="kw">this-></span>B <span class="kw">= </span>0<span class="kw">;
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| 29 | </span>$<span class="kw">this-></span>I <span class="kw">= </span>0<span class="kw">;
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| 30 | </span>$<span class="kw">this-></span>U <span class="kw">= </span>0<span class="kw">;
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| 31 | </span>$<span class="kw">this-></span>HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
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| 32 | }
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| 33 |
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| 34 | function </span>WriteHTML<span class="kw">(</span>$html<span class="kw">)
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| 35 | {
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| 36 | </span><span class="cmt">// HTML parser
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| 37 | </span>$html <span class="kw">= </span>str_replace<span class="kw">(</span><span class="str">"\n"</span><span class="kw">,</span><span class="str">' '</span><span class="kw">,</span>$html<span class="kw">);
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| 38 | </span>$a <span class="kw">= </span>preg_split<span class="kw">(</span><span class="str">'/<(.*)>/U'</span><span class="kw">,</span>$html<span class="kw">,-</span>1<span class="kw">,</span>PREG_SPLIT_DELIM_CAPTURE<span class="kw">);
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| 39 | foreach(</span>$a <span class="kw">as </span>$i<span class="kw">=></span>$e<span class="kw">)
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| 40 | {
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| 41 | if(</span>$i<span class="kw">%</span>2<span class="kw">==</span>0<span class="kw">)
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| 42 | {
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| 43 | </span><span class="cmt">// Text
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| 44 | </span><span class="kw">if(</span>$<span class="kw">this-></span>HREF<span class="kw">)
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| 45 | </span>$<span class="kw">this-></span>PutLink<span class="kw">(</span>$<span class="kw">this-></span>HREF<span class="kw">,</span>$e<span class="kw">);
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| 46 | else
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| 47 | </span>$<span class="kw">this-></span>Write<span class="kw">(</span>5<span class="kw">,</span>$e<span class="kw">);
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| 48 | }
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| 49 | else
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| 50 | {
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| 51 | </span><span class="cmt">// Tag
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| 52 | </span><span class="kw">if(</span>$e<span class="kw">[</span>0<span class="kw">]==</span><span class="str">'/'</span><span class="kw">)
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| 53 | </span>$<span class="kw">this-></span>CloseTag<span class="kw">(</span>strtoupper<span class="kw">(</span>substr<span class="kw">(</span>$e<span class="kw">,</span>1<span class="kw">)));
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| 54 | else
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| 55 | {
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| 56 | </span><span class="cmt">// Extract attributes
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| 57 | </span>$a2 <span class="kw">= </span>explode<span class="kw">(</span><span class="str">' '</span><span class="kw">,</span>$e<span class="kw">);
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| 58 | </span>$tag <span class="kw">= </span>strtoupper<span class="kw">(</span>array_shift<span class="kw">(</span>$a2<span class="kw">));
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| 59 | </span>$attr <span class="kw">= array();
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| 60 | foreach(</span>$a2 <span class="kw">as </span>$v<span class="kw">)
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| 61 | {
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| 62 | if(</span>preg_match<span class="kw">(</span><span class="str">'/([^=]*)=["\']?([^"\']*)/'</span><span class="kw">,</span>$v<span class="kw">,</span>$a3<span class="kw">))
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| 63 | </span>$attr<span class="kw">[</span>strtoupper<span class="kw">(</span>$a3<span class="kw">[</span>1<span class="kw">])] = </span>$a3<span class="kw">[</span>2<span class="kw">];
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| 64 | }
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| 65 | </span>$<span class="kw">this-></span>OpenTag<span class="kw">(</span>$tag<span class="kw">,</span>$attr<span class="kw">);
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| 66 | }
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| 67 | }
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | function </span>OpenTag<span class="kw">(</span>$tag<span class="kw">, </span>$attr<span class="kw">)
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| 72 | {
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| 73 | </span><span class="cmt">// Opening tag
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| 74 | </span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
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| 75 | </span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>true<span class="kw">);
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| 76 | if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
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| 77 | </span>$<span class="kw">this-></span>HREF <span class="kw">= </span>$attr<span class="kw">[</span><span class="str">'HREF'</span><span class="kw">];
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| 78 | if(</span>$tag<span class="kw">==</span><span class="str">'BR'</span><span class="kw">)
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| 79 | </span>$<span class="kw">this-></span>Ln<span class="kw">(</span>5<span class="kw">);
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| 80 | }
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| 81 |
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| 82 | function </span>CloseTag<span class="kw">(</span>$tag<span class="kw">)
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| 83 | {
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| 84 | </span><span class="cmt">// Closing tag
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| 85 | </span><span class="kw">if(</span>$tag<span class="kw">==</span><span class="str">'B' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'I' </span><span class="kw">|| </span>$tag<span class="kw">==</span><span class="str">'U'</span><span class="kw">)
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| 86 | </span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span>$tag<span class="kw">,</span>false<span class="kw">);
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| 87 | if(</span>$tag<span class="kw">==</span><span class="str">'A'</span><span class="kw">)
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| 88 | </span>$<span class="kw">this-></span>HREF <span class="kw">= </span><span class="str">''</span><span class="kw">;
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| 89 | }
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| 90 |
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| 91 | function </span>SetStyle<span class="kw">(</span>$tag<span class="kw">, </span>$enable<span class="kw">)
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| 92 | {
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| 93 | </span><span class="cmt">// Modify style and select corresponding font
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| 94 | </span>$<span class="kw">this-></span>$tag <span class="kw">+= (</span>$enable <span class="kw">? </span>1 <span class="kw">: -</span>1<span class="kw">);
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| 95 | </span>$style <span class="kw">= </span><span class="str">''</span><span class="kw">;
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| 96 | foreach(array(</span><span class="str">'B'</span><span class="kw">, </span><span class="str">'I'</span><span class="kw">, </span><span class="str">'U'</span><span class="kw">) as </span>$s<span class="kw">)
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| 97 | {
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| 98 | if(</span>$<span class="kw">this-></span>$s<span class="kw">></span>0<span class="kw">)
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| 99 | </span>$style <span class="kw">.= </span>$s<span class="kw">;
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| 100 | }
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| 101 | </span>$<span class="kw">this-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span>$style<span class="kw">);
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| 102 | }
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| 103 |
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| 104 | function </span>PutLink<span class="kw">(</span>$URL<span class="kw">, </span>$txt<span class="kw">)
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| 105 | {
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| 106 | </span><span class="cmt">// Put a hyperlink
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| 107 | </span>$<span class="kw">this-></span>SetTextColor<span class="kw">(</span>0<span class="kw">,</span>0<span class="kw">,</span>255<span class="kw">);
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| 108 | </span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>true<span class="kw">);
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| 109 | </span>$<span class="kw">this-></span>Write<span class="kw">(</span>5<span class="kw">,</span>$txt<span class="kw">,</span>$URL<span class="kw">);
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| 110 | </span>$<span class="kw">this-></span>SetStyle<span class="kw">(</span><span class="str">'U'</span><span class="kw">,</span>false<span class="kw">);
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| 111 | </span>$<span class="kw">this-></span>SetTextColor<span class="kw">(</span>0<span class="kw">);
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| 112 | }
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| 113 | }
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| 114 |
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| 115 | </span>$html <span class="kw">= </span><span class="str">'You can now easily print text mixing different styles: <b>bold</b>, <i>italic</i>,
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| 116 | <u>underlined</u>, or <b><i><u>all at once</u></i></b>!<br><br>You can also insert links on
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| 117 | text, such as <a href="http://www.fpdf.org">www.fpdf.org</a>, or on an image: click on the logo.'</span><span class="kw">;
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| 118 |
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| 119 | </span>$pdf <span class="kw">= new </span>PDF<span class="kw">();
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| 120 | </span><span class="cmt">// First page
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| 121 | </span>$pdf<span class="kw">-></span>AddPage<span class="kw">();
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| 122 | </span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">'Arial'</span><span class="kw">,</span><span class="str">''</span><span class="kw">,</span>20<span class="kw">);
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| 123 | </span>$pdf<span class="kw">-></span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">"To find out what's new in this tutorial, click "</span><span class="kw">);
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| 124 | </span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">,</span><span class="str">'U'</span><span class="kw">);
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| 125 | </span>$link <span class="kw">= </span>$pdf<span class="kw">-></span>AddLink<span class="kw">();
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| 126 | </span>$pdf<span class="kw">-></span>Write<span class="kw">(</span>5<span class="kw">,</span><span class="str">'here'</span><span class="kw">,</span>$link<span class="kw">);
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| 127 | </span>$pdf<span class="kw">-></span>SetFont<span class="kw">(</span><span class="str">''</span><span class="kw">);
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| 128 | </span><span class="cmt">// Second page
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| 129 | </span>$pdf<span class="kw">-></span>AddPage<span class="kw">();
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| 130 | </span>$pdf<span class="kw">-></span>SetLink<span class="kw">(</span>$link<span class="kw">);
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| 131 | </span>$pdf<span class="kw">-></span>Image<span class="kw">(</span><span class="str">'logo.png'</span><span class="kw">,</span>10<span class="kw">,</span>12<span class="kw">,</span>30<span class="kw">,</span>0<span class="kw">,</span><span class="str">''</span><span class="kw">,</span><span class="str">'http://www.fpdf.org'</span><span class="kw">);
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| 132 | </span>$pdf<span class="kw">-></span>SetLeftMargin<span class="kw">(</span>45<span class="kw">);
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| 133 | </span>$pdf<span class="kw">-></span>SetFontSize<span class="kw">(</span>14<span class="kw">);
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| 134 | </span>$pdf<span class="kw">-></span>WriteHTML<span class="kw">(</span>$html<span class="kw">);
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| 135 | </span>$pdf<span class="kw">-></span>Output<span class="kw">();
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| 136 | </span>?></code></pre>
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| 137 | </div>
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| 138 | <p class='demo'><a href='tuto6.php' target='_blank' class='demo'>[Demo]</a></p>
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| 139 | The new method to print text is <a href='../doc/write.htm'>Write()</a>. It's very close to <a href='../doc/multicell.htm'>MultiCell()</a>; the differences are:
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| 140 | <ul>
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| 141 | <li>The end of line is at the right margin and the next line begins at the left one</li>
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| 142 | <li>The current position moves at the end of the text</li>
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| 143 | </ul>
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| 144 | So it allows to write a chunk of text, alter the font style, then continue from the exact
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| 145 | place we left it. On the other hand, you cannot justify it.
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| 146 | <br>
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| 147 | <br>
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| 148 | The method is used on the first page to put a link pointing to the second one. The beginning of
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| 149 | the sentence is written in regular style, then we switch to underline and finish it. The link
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| 150 | is created with <a href='../doc/addlink.htm'>AddLink()</a>, which returns a link identifier. The identifier is
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| 151 | passed as third parameter of Write(). Once the second page is created, we use <a href='../doc/setlink.htm'>SetLink()</a> to
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| 152 | make the link point to the beginning of the current page.
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| 153 | <br>
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| 154 | <br>
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| 155 | Then we put an image with an external link on it. An external link is just a URL. It's passed as
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| 156 | last parameter of <a href='../doc/image.htm'>Image()</a>.
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| 157 | <br>
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| 158 | <br>
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| 159 | Finally, the left margin is moved after the image with <a href='../doc/setleftmargin.htm'>SetLeftMargin()</a> and some text in
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| 160 | HTML format is output. A very simple HTML parser is used for this, based on regular expressions.
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| 161 | Recognized tags are <b>, <i>, <u>, <a> and <br>; the others are
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| 162 | ignored. The parser also makes use of the Write() method. An external link is put the same way as
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| 163 | an internal one (third parameter of Write()). Note that <a href='../doc/cell.htm'>Cell()</a> also allows to put links.
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| 164 | </body>
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| 165 | </html>
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