How to reverse a string in PHP?

To reverse a string in PHP, you can use the strrev() function. This function returns a string in which the characters are reversed.

For example:

$string = 'Hello';
$reversed = strrev($string);

// $reversed will be equal to 'olleH'

If you want to reverse a string without using any built-in functions, you can use a loop to iterate through the string and build a new string with the characters in the reverse order.

For example:

$string = 'Hello';
$reversed = '';

for ($i = strlen($string) - 1; $i >= 0; $i--) {
    $reversed .= $string[$i];
}

// $reversed will be equal to 'olleH'

You can also use the str_split() function to split the string into an array of characters, and then use array_reverse() to reverse the order of the elements in the array. Finally, you can use implode() to join the elements of the array back into a string.

For example:

$string = 'Hello';
$characters = str_split($string);
$characters = array_reverse($characters);
$reversed = implode('', $characters);

// $reversed will be equal to 'olleH'