strtr
Modified version of the original posted function. Use this one:
<?php
if (!function_exists('substr_compare')) {
function substr_compare($main_str, $str, $offset, $length = NULL, $case_insensitivity = false) {
$offset = (int) $offset;
// Throw a warning because the offset is invalid
if ($offset >= strlen($main_str)) {
trigger_error('The start position cannot exceed initial string length.', E_USER_WARNING);
return false;
}
// We are comparing the first n-characters of each string, so let's use the PHP function to do it
if ($offset == 0 && is_int($length) && $case_insensitivity === true) {
return strncasecmp($main_str, $str, $length);
}
// Get the substring that we are comparing
if (is_int($length)) {
$main_substr = substr($main_str, $offset, $length);
$str_substr = substr($str, 0, $length);
} else {
$main_substr = substr($main_str, $offset);
$str_substr = $str;
}
// Return a case-insensitive comparison of the two strings
if ($case_insensitivity === true) {
return strcasecmp($main_substr, $str_substr);
}
// Return a case-sensitive comparison of the two strings
return strcmp($main_substr, $str_substr);
}
}
?>
substr_compare
(PHP 5)
substr_compare — Binary safe comparison of 2 strings from an offset, up to length characters
Description
int substr_compare
( string $main_str
, string $str
, int $offset
[, int $length
[, bool $case_insensitivity
]] )
substr_compare() compares main_str from position offset with str up to length characters.
Parameters
- main_str
-
- str
-
- offset
-
The start position for the comparison. If negative, it starts counting from the end of the string.
- length
-
The length of the comparison.
- case_insensitivity
-
If case_insensitivity is TRUE, comparison is case insensitive.
Return Values
Returns < 0 if main_str from position offset is less than str , > 0 if it is greater than str , and 0 if they are equal. If length is equal or greater than length of main_str and length is set, substr_compare() prints warning and returns FALSE.
ChangeLog
| Version | Description |
|---|---|
| 5.1.0 | Added the possibility to use a negative offset . |
Examples
Example #1 A substr_compare() example
<?php
echo substr_compare("abcde", "bc", 1, 2); // 0
echo substr_compare("abcde", "de", -2, 2); // 0
echo substr_compare("abcde", "bcg", 1, 2); // 0
echo substr_compare("abcde", "BC", 1, 2, true); // 0
echo substr_compare("abcde", "bc", 1, 3); // 1
echo substr_compare("abcde", "cd", 1, 2); // -1
echo substr_compare("abcde", "abc", 5, 1); // warning
?>
add a note
User Contributed Notessubstr_compare
sleek
23-May-2005 02:07
23-May-2005 02:07