Modify Strings

Upper Case

Example

The strtoupper() function converts the string to uppercase.

$x = "Hello World!";
echo strtoupper($x);

Lower Case

Example

The strtolower() function converts the string to lowercase.

$x = "Hello World!";
echo strtolower($x);

Replace String

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

Example

Replace the text “World” with “Dolly”:

$x = "Hello World!";
echo str_replace("World", "Dolly", $x);

Reverse a String

The PHP strrev() function reverses a string.

Example

Reverse the string “Hello World!”:

$x = "Hello World!";
echo strrev($x);

Remove Whitespace

Whitespace refers to the spaces before and/or after the actual text, and you often want to remove this extra space.

Example

The trim() function removes any whitespace from the beginning and end of a string.

$x = " Hello World! ";
echo trim($x);

Convert String into Array

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

The first parameter of the explode() function indicates the “separator,” which specifies the points at which to split the string.

Example

Split the string into an array using the space character as the 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! )
*/