How to Remove All Spaces Out of a String in PHP

  1. Use str_replace() Function to Strip All Spaces Out in PHP
  2. Use preg_replace() Function to Strip All Spaces Out in PHP

This article will introduce methods to strip all spaces out of a string in PHP. Striping all spaces out means to remove all spaces from a given string.

  • Using str_replace() function
  • Using preg_replace() function

Use str_replace() Function to Strip All Spaces Out in PHP

We use the built-in function str_replace() to replace the substring from a string or an array. The replacement string is passed as a parameter. The correct syntax to use this function is as follows.

str_replace($searchString, $replaceString, $originalString, $count);

The built-in function str_replace() has four parameters. The details of its parameters are as follows

Parameters Description
$searchString mandatory It is the substring or an array that we want to find and replace.
$replaceString mandatory It is the string that we want to put in place of the $searchString. The function will check the occurrences of $searchString and replace it with $replaceString. It can be an array as well.
$originalString mandatory It is the original string from which we want to find a substring or a character to replace.
$count optional It specifies the total number of the replacements done on the $originalString.

This function returns the final string obtained after performing all the replacements on it.

The program below shows how we can use the str_replace() function to remove all the spaces from a given string.

<?php 
$searchString = " ";
$replaceString = "";
$originalString = "This is a programming tutorial"; 
 
$outputString = str_replace($searchString, $replaceString, $originalString); 
echo("The original string is: $originalString \n");  
echo("The string without spaces is: $outputString"); 
  
?> 

We have passed a space character as $searchString and an empty string as $replaceString. The output will be the string without spaces.

Output:

The original string is: This is a programming tutorial 
The string without spaces is: Thisisaprogrammingtutorial 

Now, if we pass the $count parameter, the function will tell us the number of replacements made on this string.

<?php 
$searchString = " ";
$replaceString = "";
$originalString = "This is a programming tutorial"; 
 
$outputString = str_replace($searchString, $replaceString, $originalString, $count); 
echo("The original string is: $originalString \n");  
echo("The string without spaces is: $outputString \n"); 
echo("The number of replacement operations is: $count");
  
?> 

Output:

The original string is: This is a programming tutorial 
The string without spaces is: Thisisaprogrammingtutorial 
The number of replacement operations is: 4

Use preg_replace() Function to Strip All Spaces Out in PHP

In PHP, we can also use the preg_replace() function to remove all spaces from a string. This function will not just remove the space character, but it will also remove tabs if there are any in our string. The correct syntax to use this function is as follows:

preg_replace($regexPattern, $replacementVar, $original, $limit, $count)

The function preg_replace() accepts five parameters. The detail of its parameters is as follows

Parameters Description
$regexPattern mandatory It is the pattern we will search in the original string or array.
$replacementVar mandatory It is the string or array we use as a replacement for the searched value.
$original mandatory It is the string or an array from which we want to find value and replace it.
$limit optional This parameter limits the number of replacements.
$count optional This parameter tells about the number of total replacements made on our original string or array.

We will use the pattern /\s+/ to find white spaces. The program that removes the spaces from the string is as follows:

<?php 
$searchString = " ";
$replaceString = "";
$originalString = "This is a programming tutorial"; 
 
$outputString = preg_replace('/\s+/', '', $originalString); 
echo("The original string is: $originalString \n");  
echo("The string without spaces is: $outputString \n"); 
?> 

Output:

The original string is: This is a programming tutorial 
The string without spaces is: Thisisaprogrammingtutorial 

We know that the total number of replacements on this string is 4. Now we will limit the number of replacements.

<?php 
$searchString = " ";
$replaceString = "";
$limit = 2;
$originalString = "This is a programming tutorial"; 
 
$outputString = preg_replace('/\s+/', '', $originalString,$limit); 
echo("The original string is: $originalString \n");  
echo("The string without spaces is: $outputString \n"); 
  
?> 

Output:

The original string is: This is a programming tutorial 
The string without spaces is: Thisisa programming tutorial

Note that now there are only two replacements.

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