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对strpos()函数可以用来在php中查找子字符串。strpos()函数将试图找到子字符串在源字符串中首次出现的位置。如果找到了,它会返回一个非负整数表示子字符串出现的位置。 否则它会返回一个布尔值false。
1 2 3 4 5 6 7 8 9 10 11 | <?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
1 2 3 4 5 | 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 |