PHP - Modify Strings
PHP has a set of built-in functions that you can use to modify strings.
Upper Case
The PHP strtoupper() function returns a string in upper case.
Example
Return the string in upper case:
$x = "Hello World!";
echo strtoupper($x);
Lower Case
The PHP strtolower() function returns a string in lower case.
Example
Return the string in lower case:
$x = "Hello World!";
echo strtolower($x);
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);
Reverse a String
The PHP strrev() function reverses a string.
Remove Whitespace
Whitespace is the space before and/or after the actual text, and very often you want to remove this space.
The PHP trim()
function removes any whitespace from the beginning or the end.
Example
Remove any whitespace from the beginning or the end:
$x = " Hello World! ";
echo trim($x);
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! )
*/
Complete PHP String Reference
For a complete reference of all string functions, go to our complete PHP String Reference.
