php在指定字符串中查找子字符串
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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");
?>
输出结果
pos1 = (13); type is integer
pos2 = (0); type is integer
pos3 = (); type is boolean
pos3返回的是bool值，即没有找到子字符串
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