array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'function.ctype-lower.php', 1 => 'ctype_lower', ), 'up' => array ( 0 => 'ref.ctype.php', 1 => 'Ctype 函数', ), 'prev' => array ( 0 => 'function.ctype-graph.php', 1 => 'ctype_graph', ), 'next' => array ( 0 => 'function.ctype-print.php', 1 => 'ctype_print', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'zh', 'path' => 'reference/ctype/functions/ctype-lower.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_lower — 检测小写字符
示例 #1 ctype_lower() 示例 (使用默认的语言环境)
<?php
$strings = array('aac123', 'qiutoas', 'QASsdks');
foreach ($strings as $testcase) {
if (ctype_lower($testcase)) {
echo "The string $testcase consists of all lowercase letters.\n";
} else {
echo "The string $testcase does not consist of all lowercase letters.\n";
}
}
?>
以上示例会输出:
The string aac123 does not consist of all lowercase letters. The string qiutoas consists of all lowercase letters. The string QASsdks does not consist of all lowercase letters.