Question

How to use strcspn() function to scan $string1 for the first occurrence of any character of $string2 in PHP

Answer 1

// int strcspn( string $subject , string $mask [, int $start [, int $length ]])
// Returns the length of the initial segment of string that contain characters not in mask

$s1 = "f35";
$s2 = "121258y";
     
// found the number 5 from $s2 in $s1[2]
 
// return the number of characters of $s1 that read before first occurrence  of the number 5 

echo "The first occurrence in s1 is at index " . (int)strcspn($s1, $s2);


/*
run:
    
The first occurrence in s1 is at index 2 
    
*/

 

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