PHP » Strings » strspn()
- Syntax:
- int strspn(string s1, string s2)
- s1
- The string to be counted.
- s2
- Characters that count.
Checks character occurrences in a string.
This function returns how far into the first string, characters from only the second string appear. The result is returned as a number of characters.
Examples
Code:
<?php
$array1 = range(0, 9);
$array2 = range("a", "z");
$chars = implode("", $array1) . implode("", $array2);
$username = "smith!";
print "Legal characters: $chars<br>";
if (($n = strspn($username, $chars)) != strlen($username)) {
print "$n legal characters in username \"$username\". It is not a legal username.";
}
?> Output:
Legal characters: 0123456789abcdefghijklmnopqrstuvwxyz
5 legal characters in username "smith!". It is not a legal username. Explanation:
One use of this function is to check that the characters of a string belong to a specific set.
See Also:
