array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'function.ctype-print.php', 1 => 'ctype_print', ), 'up' => array ( 0 => 'ref.ctype.php', 1 => 'Ctype 函数', ), 'prev' => array ( 0 => 'function.ctype-lower.php', 1 => 'ctype_lower', ), 'next' => array ( 0 => 'function.ctype-punct.php', 1 => 'ctype_punct', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'zh', 'path' => 'reference/ctype/functions/ctype-print.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_print — 检测可打印字符
如果在当前的语言环境下 text
里面的每个字符都能被实际输出(包括空白),那么就返回
true
;如果 text
包含控制字符或者没有任何输出的字符,那么就返回
false
。当使用空字符串调用时,结果始终为 false
。
示例 #1 ctype_print() 示例
<?php
$strings = array('string1' => "asdf\n\r\t", 'string2' => 'arf12', 'string3' => 'LKA#@%.54');
foreach ($strings as $name => $testcase) {
if (ctype_print($testcase)) {
echo "The string '$name' consists of all printable characters.\n";
} else {
echo "The string '$name' does not consist of all printable characters.\n";
}
}
?>
以上示例会输出:
The string 'string1' does not consist of all printable characters. The string 'string2' consists of all printable characters. The string 'string3' consists of all printable characters.