1 | <?php
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2 | /*
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3 | http://www.w3.org/TR/xmlschema-2/
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4 |
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5 | [Definition:] duration represents a duration of time. The value space of
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6 | duration is a six-dimensional space where the coordinates designate the
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7 | Gregorian year, month, day, hour, minute, and second components
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8 | defined in 5.5.3.2 of [ISO 8601], respectively. These components are
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9 | ordered in their significance by their order of appearance i.e. as year,
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10 | month, day, hour, minute, and second.
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11 |
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12 | 3.2.6.1 Lexical representation
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13 | The lexical representation for duration is the [ISO 8601] extended
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14 | format PnYn MnDTnH nMnS, where nY represents the number of
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15 | years, nM the number of months, nD the number of days, 'T' is the
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16 | date/time separator, nH the number of hours, nM the number of
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17 | minutes and nS the number of seconds. The number of seconds
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18 | can include decimal digits to arbitrary precision.
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19 |
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20 | The values of the Year, Month, Day, Hour and Minutes components
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21 | are not restricted but allow an arbitrary integer. Similarly, the
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22 | value of the Seconds component allows an arbitrary decimal.
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23 | Thus, the lexical representation of duration does not follow the
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24 | alternative format of 5.5.3.2.1 of [ISO 8601].
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25 |
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26 | An optional preceding minus sign ('-') is allowed, to indicate a
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27 | negative duration. If the sign is omitted a positive duration is
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28 | indicated. See also ISO 8601 Date and Time Formats (D).
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29 |
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30 | For example, to indicate a duration of 1 year, 2 months, 3 days,
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31 | 10 hours, and 30 minutes, one would write: P1Y2M3DT10H30M.
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32 | One could also indicate a duration of minus 120 days as: -P120D.
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33 |
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34 | Reduced precision and truncated representations of this format
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35 | are allowed provided they conform to the following:
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36 |
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37 | If the number of years, months, days, hours, minutes, or seconds
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38 | in any expression equals zero, the number and its corresponding
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39 | designator *may* be omitted. However, at least one number and
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40 | its designator *must* be present.
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41 | The seconds part *may* have a decimal fraction.
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42 | The designator 'T' shall be absent if all of the time items are absent.
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43 | The designator 'P' must always be present.
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44 | For example, P1347Y, P1347M and P1Y2MT2H are all allowed; P0Y1347M
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45 | and P0Y1347M0D are allowed. P-1347M is not allowed although -P1347M
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46 | is allowed. P1Y2MT is not allowed.
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47 |
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48 | */
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49 |
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50 | /* this is only an aproximation of duration, more work still to do.
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51 | see above schema url for more info on duration
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52 |
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53 | TODO: figure out best aproximation for year and month conversion to seconds
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54 | */
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55 |
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56 | $ereg_duration = '(-)?P([0-9]+Y)?([0-9]+M)?([0-9]+D)?T?([0-9]+H)?([0-9]+M)?([0-9]+S)?';
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57 | class SOAP_Type_duration
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58 | {
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59 | // format PnYnMnDTnHnMnS
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60 | function unix_to_duration($seconds) {
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61 | return SOAP_Type_duration::getduration($seconds);
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62 | }
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63 |
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64 | function mod($a, $b, &$d, &$r) {
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65 | $d = floor( $a / $b );
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66 | $r = $a % $b;
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67 | }
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68 |
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69 | function getduration($seconds) {
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70 | $neg = '';
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71 | if ($seconds < 0) {
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72 | $neg = '-';
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73 | $seconds = $seconds * -1;
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74 | }
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75 |
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76 | $_mi = 60;
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77 | $_h = $_mi * 60;
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78 | $_d = $_h * 24;
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79 | // XXX how do we properly handle month and year values?
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80 | $_m = $_d * 30;
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81 | $_y = $_d * 365;
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82 |
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83 | SOAP_Type_duration::mod($seconds, $_y, $y, $seconds);
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84 | SOAP_Type_duration::mod($seconds, $_m, $m, $seconds);
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85 | SOAP_Type_duration::mod($seconds, $_d, $d, $seconds);
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86 | SOAP_Type_duration::mod($seconds, $_h, $h, $seconds);
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87 | SOAP_Type_duration::mod($seconds, $_mi, $mi, $s);
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88 |
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89 | $duration = $neg.'P';
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90 | if ($y) $duration .= $y.'Y';
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91 | if ($m) $duration .= $m.'M';
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92 | if ($d) $duration .= $d.'D';
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93 | if ($h || $mi || $s) $duration .='T';
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94 | if ($h) $duration .= $h.'H';
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95 | if ($mi) $duration .= $mi.'M';
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96 | if ($s) $duration .= $s.'S';
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97 | if ($duration == 'P' || $duration == '-P') $duration = 'PT0S';
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98 | return $duration;
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99 | }
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100 |
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101 | function mkduration($n, $Y, $Mo, $D, $H, $Mi, $S) {
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102 | $_mi = 60;
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103 | $_h = $_mi * 60;
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104 | $_d = $_h * 24;
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105 | // XXX how do we properly handle month and year values?
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106 | $_m = $_d * 30;
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107 | $_y = $_d * 365;
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108 |
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109 | $sec = $Y * $_y + $Mo * $_m + $D * $_d + $H * $_h + $Mi * $_mi + $S;
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110 | if ($n == '-') $sec = $sec * -1;
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111 | return $sec;
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112 | }
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113 |
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114 | function duration_to_unix($duration) {
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115 | global $ereg_duration;
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116 | if (ereg($ereg_duration,$duration,$regs)) {
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117 | return SOAP_Type_duration::mkduration($regs[1], $regs[2], $regs[3], $regs[4], $regs[5], $regs[6], $regs[7]);
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118 | }
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119 | return FALSE;
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120 | }
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121 |
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122 | function is_duration($duration) {
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123 | global $ereg_duration;
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124 | return ereg($ereg_duration,$duration,$regs);
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125 | }
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126 |
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127 | function _test($time) {
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128 | if (SOAP_Type_duration::is_duration($time)) {
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129 | $t = SOAP_Type_duration::duration_to_unix($time);
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130 | echo "Duration: $time is ".$t." seconds\n";
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131 | } else {
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132 | $t = SOAP_Type_duration::unix_to_duration($time);
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133 | echo "Seconds: $time is ".$t." duration\n";
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134 | }
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135 | return $t;
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136 | }
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137 |
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138 | function add($d1, $d2) {
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139 | $s1 = SOAP_Type_duration::duration_to_unix($d1);
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140 | $s2 = SOAP_Type_duration::duration_to_unix($d2);
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141 | return SOAP_Type_duration::unix_to_duration($s1 + $s2);
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142 | }
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143 |
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144 | function subtract($d1, $d2) {
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145 | $s1 = SOAP_Type_duration::duration_to_unix($d1);
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146 | $s2 = SOAP_Type_duration::duration_to_unix($d2);
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147 | return SOAP_Type_duration::unix_to_duration($s1 - $s2);
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148 | }
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149 |
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150 | }
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151 |
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152 | /* tests */
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153 |
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154 | $t = SOAP_Type_duration::_test('P1Y2M3DT10H30M');
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155 | SOAP_Type_duration::_test($t);
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156 | $t = SOAP_Type_duration::_test('-P120D');
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157 | SOAP_Type_duration::_test($t);
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158 |
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159 | // duration since 1970
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160 | $t = SOAP_Type_duration::_test(time());
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161 | SOAP_Type_duration::_test($t);
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162 |
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163 | print "Add should be PT0S: ".SOAP_Type_duration::add('-P120D','P4M')."\n";
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164 | print "Subtract should be PT0S: ".SOAP_Type_duration::subtract('P120D','P4M')."\n";
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165 | ?> |
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