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<div class="codetitle"><a style="CURSOR: pointer" data="97794" class="copybut" id="copybut97794" onclick="doCopy('code97794')"> 代码如下:<div class="codebody" id="code97794">
<?php
/
判断字符串是否存在的函数
/
function strexists($haystack,$needle) {
return !(strpos($haystack,$needle) === FALSE);//注意这里的"==="
}
/
Test
/
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring,$findme); // Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
// 简单的使用 "==" 号是不会起作用的，需要使用 "==="，因为 a 第一次出现的位置为 0
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
} // We can search for the character,ignoring anything before the offset
// 在搜索字符的时候可以使用参数 offset 来指定偏移量
$newstring = 'abcdef abcdef';
$pos = strpos($newstring,'a',1); // $pos = 7,not 0
?>
（编辑：李大同）
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