php实现指定字符串中查找子字符串的方法

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<?php

$haystack1 = "2349534134345w3mentor16504381640386488129";

$haystack2 = "w3mentor234953413434516504381640386488129";

$haystack3 = "center234953413434516504381640386488129fyi";

$pos1 = strpos($haystack1, "w3mentor");

$pos2 = strpos($haystack2, "w3mentor");

$pos3 = strpos($haystack3, "w3mentor");

print("pos1 = ($pos1); type is " . gettype($pos1) . "\n");

print("pos2 = ($pos2); type is " . gettype($pos2) . "\n");

print("pos3 = ($pos3); type is " . gettype($pos3) . "\n");

?>