The `strrpos()` function in PHP is used to find the position of the last occurrence of a substring within a string. It searches for the last occurrence of a specified substring (needle) within a string (haystack). If the substring is found, `strrpos()` returns the position of the last occurrence of the substring in the haystack. If the substring is not found, it returns `false`.
Here's the syntax of `strrpos()` function:
<?php strrpos(string $haystack, string $needle, int $offset = 0): int|false ?>1. `$haystack`: The string to search within. 2. `$needle`: The substring to search for. 3. `$offset` (optional): The position in the haystack to start searching from. If specified, searching starts from this position. If a negative offset is used, searching starts from the end of the string. Now, let's see an example of how to use `strrpos()` in PHP:
<?php
$string = "Hello world, hello PHP!";
$substring = "hello";
// Find the last occurrence of the substring in the string
$position = strrpos($string, $substring);
if ($position !== false) {
echo "Last occurrence of '$substring' found at position: $position";
} else {
echo "Substring '$substring' not found in the string.";
}
?>
Output:
Last occurrence of 'hello' found at position: 13In this example, we're searching for the last occurrence of the substring "hello" within the string "Hello world, hello PHP!". The `strrpos()` function returns the position of the last occurrence, which is 13. We then check if the position is not `false` (indicating that the substring was found) and display the position accordingly.