<?php <BR>/* <BR>判断字符串是否存在的函数 <BR>*/ <BR>function strexists($haystack, $needle) { <BR>return !(strpos($haystack, $needle) === FALSE);//注意这里的"===" <BR>} <BR>/* <BR>Test <BR>*/ <BR>$mystring = 'abc'; <BR>$findme = 'a'; <BR>$pos = strpos($mystring, $findme); <br><br>// Note our use o<mark style="color:transparent">本%文来源gaodaimacom搞#^代%!码网@</mark>搞代gaodaima码f ===. Simply == would not work as expected <BR>// because the position of 'a' was the 0th (first) character. <BR>// 简单的使用 "==" 号是不会起作用的,需要使用 "===",因为 a 第一次出现的位置为 0 <BR>if ($pos === false) { <BR>echo "The string '$findme' was not found in the string '$mystring'"; <BR>} else { <BR>echo "The string '$findme' was found in the string '$mystring'"; <BR>echo " and exists at position $pos"; <BR>} <br><br>// We can search for the character, ignoring anything before the offset <BR>// 在搜索字符的时候可以使用参数 offset 来指定偏移量 <BR>$newstring = 'abcdef abcdef'; <BR>$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0 <BR>?><BR>