PHP strrchr() Function: Syntax, Usage, Examples, and Case Sensitivity

Syntax of strrchr()

The strrchr() function is a PHP string function used to find the last occurrence of a specified character in a string and return that position together with all characters that follow it.

<code>strrchr(string $haystack, mixed $needle): string|false</code>

In this signature, $haystack is the string to be searched, and $needle is the character or substring to look for.

Usage of strrchr()

Return Value

The function returns a string containing the portion of $haystack from the found character or substring to the end of the string. If the character or substring is not found, it returns false .

Example

Below is an example demonstrating how to use strrchr() :

<code>$str = "Hello, World!";
$lastComma = strrchr($str, ",");
echo $lastComma; // outputs: , World!</code>

In this example, $str is the original string, $lastComma holds the result of strrchr() , which finds the last comma and the text after it, and echo prints , World! .

Searching for a Character or Substring

The strrchr() function can search for a single character or a multi‑character substring. The following code shows two scenarios:

<code>$str = "Hello, World!";
$lastComma = strrchr($str, ",");
echo $lastComma; // outputs: , World!

$str = "Hello, World!";
$lastWord = strrchr($str, "World");
echo $lastWord; // outputs: World!</code>

In the first case the function searches for a comma, while in the second it searches for the substring "World". Whether searching for a character or a substring, strrchr() returns the found text together with everything that follows it.

Case Sensitivity

By default strrchr() is case‑sensitive, meaning a mismatch in case will cause the function to return false . For a case‑insensitive search you can use strripos() instead.

Summary

The strrchr() function is used to locate the last occurrence of a character or substring within a string and returns the portion of the string from that point to the end. It operates in a case‑sensitive manner unless you switch to a case‑insensitive alternative such as strripos() .

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