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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="array.resources.html">Resource Types</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.array.html">Array Functions</a></div> <div class="up"><a href="book.array.html">Arrays</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 always available as part of the PHP core.</p> <p class="para"> <dl> <dt> <span class="term"> <b><tt>CASE_LOWER</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>CASE_LOWER</tt></b> is used with <a href="function.array-change-key-case.html" class="function">array_change_key_case()</a> and is used to convert array keys to lower case. This is also the default case for <a href="function.array-change-key-case.html" class="function">array_change_key_case()</a>. </span> </dd> </dt> <dt> <span class="term"> <b><tt>CASE_UPPER</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>CASE_UPPER</tt></b> is used with <a href="function.array-change-key-case.html" class="function">array_change_key_case()</a> and is used to convert array keys to upper case. </span> </dd> </dt> </dl> </p> <p class="para"> Sorting order flags: <dl> <dt> <span class="term"> <b><tt>SORT_ASC</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>SORT_ASC</tt></b> is used with <a href="function.array-multisort.html" class="function">array_multisort()</a> to sort in ascending order. </span> </dd> </dt> <dt> <span class="term"> <b><tt>SORT_DESC</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>SORT_DESC</tt></b> is used with <a href="function.array-multisort.html" class="function">array_multisort()</a> to sort in descending order. </span> </dd> </dt> </dl> </p> <p class="para"> Sorting type flags: used by various sort functions <dl> <dt> <span class="term"> <b><tt>SORT_REGULAR</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>SORT_REGULAR</tt></b> is used to compare items normally. </span> </dd> </dt> <dt> <span class="term"> <b><tt>SORT_NUMERIC</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>SORT_NUMERIC</tt></b> is used to compare items numerically. </span> </dd> </dt> <dt> <span class="term"> <b><tt>SORT_STRING</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>SORT_STRING</tt></b> is used to compare items as strings. </span> </dd> </dt> <dt> <span class="term"> <b><tt>SORT_LOCALE_STRING</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> <b><tt>SORT_LOCALE_STRING</tt></b> is used to compare items as strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2. </span> </dd> </dt> </dl> </p> <dl> <dt> <span class="term"> <b><tt>COUNT_NORMAL</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>COUNT_RECURSIVE</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_OVERWRITE</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_SKIP</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_PREFIX_SAME</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_PREFIX_ALL</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_PREFIX_INVALID</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_PREFIX_IF_EXISTS</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_IF_EXISTS</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> <dt> <span class="term"> <b><tt>EXTR_REFS</tt></b> (<a href="language.types.integer.html" class="type integer">integer</a>) </span> <dd> <span class="simpara"> </span> </dd> </dt> </dl></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="array.resources.html">Resource Types</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.array.html">Array Functions</a></div> <div class="up"><a href="book.array.html">Arrays</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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