PHP str_replace function

The PHP function str_replace will replace all occurrences of a given text or texts ($search) in a string ($subject) or array of strings with a string given as a parameter/s ($replace).

str_replace(
array|string $search,
array|string $replace,
string|array $subject,
int &$count = null
): string|array

$replaced =str_replace($search, $replace, $subject);
$replaced =str_replace($search, $replace, $subject, $count); 

Parameters

$search – the value to be searched for within $subject, $search can be an array to perform multiple searches.

$replace – the value by which the value $search will be replaced if found. An array can be used for multiple replacements.

$subject – is the string or array where the values of $search will be searched for and replaced by the values of $replace.

$count – the number of replacements to be made.

Returns

Returns a string or an array with specified values replaced.

PHP str_replace examples

In the examples, we will see the most common case where we can use str_replace, and then we will see the cases where the parameters are arrays:

The most commonly used form of str_replace is to change all spaces in " " to "", this is used in the inputs for registration.

$sin_espacios= str_replace(' ', '', $input);

Let’s see what happens when $replace and $search are arrays.

//blastcoding.com ejemplo de str_replace $search(array) y $replace(array)
$mystring ="Aquí me pongo a cantar,
al compás de la vigüela
que el hombre que lo desvela
una pena extraordinaria,
como la ave solitaria
con el cantar se consuela.";

$newstring = str_replace(array("solitaria","pongo"),array("aislada","situo"),$mystring);

print_r($newstring);

Aquí me situo a cantar,
al compás de la vigüela
que el hombre que lo desvela
una pena extraordinaria,
como la ave aislada
con el cantar se consuela.

If all the parameters are arrays, we could have an example like the following:

$buscar = array("a", "b", "c");
$reemplazar = array("x", "y", "z");
$frase = array("La rapidez del abecedario.", "abc abc abc");

$fraseNueva = str_replace($buscar, $reemplazar, $frase);

print_r($fraseNueva);

Array
(
    [0] => Lx rxpidez del xyezedxrio.
    [1] => xyz xyz xyz
)