strcmp – String Compare

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

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strpos – Find the Position of a String

Finding the position of a string or substring can be made with this php functions:

• strpos($string, $seached_string [,$offset]) – returns position of the first occurrence of $searched_string inside $string or FALSE if $searched_string is not found. If $offset is specified, the seach will be made starting with $offset position.
• stripos($string, $seached_string [,$offset]) – idem, but the search is case-insensitive
• strrpos($string, $seached_string [,$offset]) – returns the position of the last occurrence of $searched_string inside $string, or FALSE
• strripos($string, $seached_string [,$offset]) – idem with strrpos but is case-insensitive

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PHP sef url function

This is another PHP sef function, much better to use in case you want to get remove characters that are not a-z, 0-9, dash, underscore or space, then remove all leading and trailing spaces, change all dashes, underscores and spaces to dashes and return the modified string in lower case.
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PHP substr() function

PHP substr() function will substract or returns the portion of string specified by the start and length parameters.
substr($string , int $start [, int $length ] )