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PHP - Modify Strings


PHP has a set of built-in functions that you can use to modify strings.


Upper Case

Example

The strtoupper() function returns the string in upper case:

$x = "Hello World!";
echo strtoupper($x);
Try it Yourself »

Lower Case

Example

The strtolower() function returns the string in lower case:

$x = "Hello World!";
echo strtolower($x);
Try it Yourself »

Replace String

The PHP str_replace() function replaces some characters with some other characters in a string.

Example

Replace the text "World" with "Dolly":

$x = "Hello World!";
echo str_replace("World", "Dolly", $x);
Try it Yourself »


Reverse a String

The PHP strrev() function reverses a string.

Example

Reverse the string "Hello World!":

$x = "Hello World!";
echo strrev($x);
Try it Yourself »

Remove Whitespace

Whitespace is the space before and/or after the actual text, and very often you want to remove this space.

Example

The trim() removes any whitespace from the beginning or the end:

$x = " Hello World! ";
echo trim($x);
Try it Yourself »

Learn more in our trim() Function Reference.


Convert String into Array

The PHP explode() function splits a string into an array.

The first parameter of the explode() function represents the "separator". The "separator" specifies where to split the string.

Note: The separator is required.

Example

Split the string into an array. Use the space character as separator:

$x = "Hello World!";
$y = explode(" ", $x);

//Use the print_r() function to display the result:
print_r($y);

/*
Result:
Array ( [0] => Hello [1] => World! )
*/
Try it Yourself »

Complete PHP String Reference

For a complete reference of all string functions, go to our complete PHP String Reference.