PHP: strspn() function
Description
The strspn() function is used to find the length of the initial segment of a string which matches characters from a second string.
Version:
(PHP 4 and above)
Syntax:
strspn(main_string, search_string, start_position, length)
Parameters:
Name | Description | Required / Optional |
Type |
---|---|---|---|
main_string | The first string. | Required | String |
search_string | The searched string. | Required | String |
start_position | Sets the starting position of the first string. Negative value counts position from the end of main_string. | Optional | Integer |
length | Sets the no. of characters to be checked in the main_string. | Optional | Integer |
Return value:
Returns the length of the initial segment of main_string.
Value Type: Integer
Pictorial Presentation
Example:
<?php
$string1='W3RESOURCE';
echo strspn($string1, 'W3Res');
?>
Output:
3
View the example in the browser
See also
PHP: Tips of the Day
In PHP, there are two versions of logical AND and OR operators.
Operator | True if |
---|---|
$a and $b | Both $a and $b are true |
$a && $b | Both $a and $b are true |
$a or $b | Either $a or $b is true |
$a || $b | Either $a or $b is true |
Note that the && and || opererators have higher precedence than and and or. See table below:
Evaluation | Result of $e | Evaluated as |
---|---|---|
$e = false || true | True | $e = (false || true) |
$e = false or true | False | ($e = false) or true |
Because of this it's safer to use && and || instead of and and or.
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