strcmp – String Compare

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Here are some of string comparation php functions:

strcmp($s1, $s2) – returns 0 if $s1 and $s2 are equal, a negativ value (-1) if $s1<$s2 and positive value (1) if $s1>$s2. The string comparation is case-sensitive, character by character, comparing character’s codes. Uppercase chars are considered smaller than minuscule chars. Numbers are considered smaller than letters.
strcasecmp($s1, $s2) – idem, but the string compare is case-insensitive
strncmp($s1, $s2, $nr) – like strcmp() but it compare only the first $nr chars of the 2 strings.
strncasecmp($s1, $s2, $nr) – idem, case-insensitive
strnatcmp($s1, $s2) – natural comparation, case-sensitive of the 2 strings (like natsort())
strnatcasecmp($s1, $s2) – idem, but case-insensitive

String compare function examples

<?php
$s1 = "1 Euro";
$s2 = "2 Euro";
$s3 = "10 Euro";
$s4 = "10 euro";
echo strcmp($s1, $s2); // -1 ($s1 is alphabetically before $s2)
echo strcmp($s3, $s4); // -1 (the code of E char is before e char)
echo strcasecmp($s3, $s4); // 0 (case insensitive, the two strings are equal)
echo strcmp($s2, $s3); // 1 (char 1 is before 2)
echo strnatcmp($s2, $s3); // -1 (char 2 as number is before 10)
echo strncmp($s1, $s4, 1); // 0 (comparing only the first char, there is equality)
?>