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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Find Length of Initial Segment of String Not Matching Mask</title> </head> <body> <?php // Sample string $str = "Hello World!"; // Defining mask $mask = "W"; // Find length of initial portion of string not matching mask echo strcspn($str, $mask); ?> </body> </html>
