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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Predefined Constants</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="pcre.resources.html">Resource Types</a></div> <div class="next" style="text-align: right; float: right;"><a href="pcre.examples.html">Examples</a></div> <div class="up"><a href="book.pcre.html">PCRE</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Predefined Constants</h1> <p class="simpara">The constants below are defined by this extension, andwill only be available when the extension has eitherbeen compiled into PHP or dynamically loaded at runtime.</p> <table border="5"> <caption><b>PREG constants</b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">constant</th> <th colspan="1">description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_PATTERN_ORDER</tt></b></td> <td colspan="1" rowspan="1" align="left"> Orders results so that $matches[0] is an array of full pattern matches, $matches[1] is an array of strings matched by the first parenthesized subpattern, and so on. This flag is only used with <a href="function.preg-match-all.html" class="function">preg_match_all()</a>. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_SET_ORDER</tt></b></td> <td colspan="1" rowspan="1" align="left"> Orders results so that $matches[0] is an array of first set of matches, $matches[1] is an array of second set of matches, and so on. This flag is only used with <a href="function.preg-match-all.html" class="function">preg_match_all()</a>. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_OFFSET_CAPTURE</tt></b></td> <td colspan="1" rowspan="1" align="left"> See the description of <b><tt>PREG_SPLIT_OFFSET_CAPTURE</tt></b>. This flag is available since PHP 4.3.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_SPLIT_NO_EMPTY</tt></b></td> <td colspan="1" rowspan="1" align="left"> This flag tells <a href="function.preg-split.html" class="function">preg_split()</a> to return only non-empty pieces. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_SPLIT_DELIM_CAPTURE</tt></b></td> <td colspan="1" rowspan="1" align="left"> This flag tells <a href="function.preg-split.html" class="function">preg_split()</a> to capture parenthesized expression in the delimiter pattern as well. This flag is available since PHP 4.0.5. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_SPLIT_OFFSET_CAPTURE</tt></b></td> <td colspan="1" rowspan="1" align="left"> If this flag is set, for every occurring match the appendant string offset will also be returned. Note that this changes the return values in an array where every element is an array consisting of the matched string at offset 0 and its string offset within subject at offset 1. This flag is available since PHP 4.3.0 and is only used for <a href="function.preg-split.html" class="function">preg_split()</a>. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_NO_ERROR</tt></b></td> <td colspan="1" rowspan="1" align="left"> Returned by <a href="function.preg-last-error.html" class="function">preg_last_error()</a> if there were no errors. Available since PHP 5.2.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_INTERNAL_ERROR</tt></b></td> <td colspan="1" rowspan="1" align="left"> Returned by <a href="function.preg-last-error.html" class="function">preg_last_error()</a> if there was an internal PCRE error. Available since PHP 5.2.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_BACKTRACK_LIMIT_ERROR</tt></b></td> <td colspan="1" rowspan="1" align="left"> Returned by <a href="function.preg-last-error.html" class="function">preg_last_error()</a> if <a href="pcre.configuration.html#ini.pcre.backtrack-limit" class="link">backtrack limit</a> was exhausted. Available since PHP 5.2.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_RECURSION_LIMIT_ERROR</tt></b></td> <td colspan="1" rowspan="1" align="left"> Returned by <a href="function.preg-last-error.html" class="function">preg_last_error()</a> if <a href="pcre.configuration.html#ini.pcre.recursion-limit" class="link">recursion limit</a> was exhausted. Available since PHP 5.2.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_BAD_UTF8_ERROR</tt></b></td> <td colspan="1" rowspan="1" align="left"> Returned by <a href="function.preg-last-error.html" class="function">preg_last_error()</a> if the last error was caused by malformed UTF-8 data (only when running a regex in <a href="reference.pcre.pattern.modifiers.html" class="link">UTF-8 mode</a>). Available since PHP 5.2.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PREG_BAD_UTF8_OFFSET_ERROR</tt></b></td> <td colspan="1" rowspan="1" align="left"> Returned by <a href="function.preg-last-error.html" class="function">preg_last_error()</a> if the offset didn't correspond to the begin of a valid UTF-8 code point (only when running a regex in <a href="reference.pcre.pattern.modifiers.html" class="link">UTF-8 mode</a>). Available since PHP 5.3.0. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><b><tt>PCRE_VERSION</tt></b></td> <td colspan="1" rowspan="1" align="left"> PCRE version and release date (e.g. "7.0 18-Dec-2006"). Available since PHP 5.2.4. </td> </tr> </tbody> </colgroup> </table></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="pcre.resources.html">Resource Types</a></div> <div class="next" style="text-align: right; float: right;"><a href="pcre.examples.html">Examples</a></div> <div class="up"><a href="book.pcre.html">PCRE</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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