How to remove all spaces in string in php

php method to remove all spaces in a string: 1. Use str_replace() function, syntax "str_replace(" ","",$str)"; 2. Use preg_replace() function, syntax "preg_replace ('/\s /','',$str)".

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

php removes all strings Space method

• Use str_replace() function to remove all spaces

• Use preg_replace() function to remove all spaces

1. Use str_replace() function

We use the built-in function str_replace() to replace substrings in strings or arrays. The replaced string is passed as a parameter. The correct syntax for using this function is as follows.

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

The built-in function str_replace() has four parameters. Its detailed parameters are as follows

OptionalIt tells the total number of substitutions made to

Parameter		Description
$searchString	Mandatory	It is the substring or array we want to find and replace
$replaceString	Mandatory	It is the string we want to place in the position of $searchString. The function will check for occurrences of $searchString and replace it with $replaceString. This function will check for an occurrence of $searchString and replace it with $replaceString. It can also be an array.
$originalString	force	It is the original string from which we want to find a substring or a characters to replace.
##$count		$originalString Times

This function returns the final string after all substitutions.

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

<?php 
header("Content-type:text/html;charset=utf-8");
$searchString = " ";
$replaceString = "";
$originalString = "This is a programming tutorial"; 
 
$outputString = str_replace($searchString, $replaceString, $originalString); 
echo "原字符串：".$originalString."<br>";  
echo "去除空格后的字符串：".$outputString; 
  
?>

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

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

<?php 
header("Content-type:text/html;charset=utf-8");
$searchString = " ";
$replaceString = "";
$originalString = "This is a programming tutorial"; 
 
$outputString = str_replace($searchString, $replaceString, $originalString, $count); 
echo "原字符串：".$originalString."<br>";  
echo "去除空格后的字符串：".$outputString."<br>"; 
echo "替换字数：".$count; 
?>

2. Use the preg_replace() function

You can also use the preg_replace() function to remove all spaces in the string . This function can remove not only space characters but also tab characters from a string. The correct syntax for using this function is as follows.

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

The function preg_replace() accepts five parameters. Its detailed parameters are as follows

ParametersDescription##$regexPattern$replacementVar$original$limit$countWe will use the pattern

force	It is what we will put in the original string Or the pattern searched in an array
mandatory	It is the string we use to replace the search value or array
force	It is a string or array from which we want to find the value and Replace it.
Optional	This parameter limits the number of replacements
Optional	This parameter tells us the total number of times to replace the original string or array

/\s /

to find spaces. The procedure to remove spaces from a string is as follows. <pre class='brush:php;toolbar:false;'>&lt;?php header(&quot;Content-type:text/html;charset=utf-8&quot;); $originalString = &quot;This is a programming tutorial&quot;; $outputString = preg_replace(&amp;#39;/\s+/&amp;#39;, &amp;#39;&amp;#39;, $originalString); echo &quot;原字符串：&quot;.$originalString.&quot;&lt;br&gt;&quot;; echo &quot;去除空格后的字符串：&quot;.$outputString.&quot;&lt;br&gt;&quot;; ?&gt;</pre>

We know that the total number of substitutions for this string is 4, now we will limit the number of substitutions.

<?php 
header("Content-type:text/html;charset=utf-8");
$searchString = " ";
$replaceString = "";
$limit = 2;
$originalString = "This is a programming tutorial"; 
 
$outputString = preg_replace(&#39;/\s+/&#39;, &#39;&#39;, $originalString,$limit); 
echo "原字符串：".$originalString."<br>";  
echo "去除空格后的字符串：".$outputString."<br>"; 

?>

#It can be seen that it was only replaced twice.

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