PHP: substr_compare() function
Description
The substr_compare() function is used to compare two strings from a given starting position in the main string.
Version:
(PHP 5)
Syntax:
substr_compare(main_string, compare_string, star_pos, length, case_insensitivity)
Parameters:
Name | Description | Required / Optional |
Type |
---|---|---|---|
main_string | The main string. | Required | String |
compare_string | The string to be compared. | Required | String |
star_pos | The starting position in the main string. | Required | Integer |
length | A positive number : Start at the specified position in the string. A negative number : Start at a specified position from the end of the string. |
Optional | Integer |
case_insensitivity | If set TRUE comparison is case insensitive. | Optional | Boolean |
Return value:
0 : If two main_string=compare_string
<0 : if the length of the main_string from the starting position is less than the compare_string
>0 : if the length of the main_string from the starting position is greater than the compare_string.
Value Type: Integer.
Pictorial Presentation
Example:
<?php
echo substr_compare('uvwxyz', 'uv', 1, 2).'<br>';
echo substr_compare('uvwxyz', 'uvw', 1, 2).'<br>';
echo substr_compare('uvwxyz', 'uv', -2, 2).'<br>';
echo substr_compare('uvwxyz', 'xy', 1, 2).'<br>';
echo substr_compare('uvwxyz', 'xyz', -3, 3).'<br>';
?>
Output:
1 1 4 -2 0
View the example in the browser
See also
Previous: strtr
Next: substr_count
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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