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How to trim all strings in an array in PHP ?

  • Difficulty Level : Hard
  • Last Updated : 09 Jul, 2021

Given a string array with white spaces, the task is to remove all white spaces from every object of an array.
Examples: 
 

Input: arr = ["Geeks  ", "   for", "  Geeks  "]
Output:
Geeks
for
Geeks

Method 1: Using trim() and array_walk() function: 
 

  • trim() Function: The trim() function is an inbuilt function which removes whitespaces and also the predefined characters from both sides of a string that is left and right.
    Syntax: 
     
trim( $string, $charlist )
  • array_walk() Function: The array_walk() function is an inbuilt function in PHP which walks through the entire array regardless of pointer position and applies a callback function or user-defined function to every element of the array. The array element’s keys and values are parameters in the callback function.
    Syntax: 
     
boolean array_walk( $array, myFunction, $extraParam )

Example: 
 

php




<?php
 
// Create an array with whitespace
$arr = array( "Geeks  ", "  for", "   Geeks   ");
 
// Print original array
echo "Original Array:\n";
foreach($arr as $key => $value)
    print($arr[$key] . "\n");
 
// Iterate array through array_walk() function
// and use trim() function to remove all
// whitespaces from every array objects
array_walk($arr, create_function('&$val',
                    '$val = trim($val);'));
 
// Print modify array
echo "\nModified Array:\n";
foreach($arr as $key => $value)
    print($arr[$key] . "\n");
     
?>
Output: 
Original Array:
Geeks  
  for
   Geeks   

Modified Array:
Geeks
for
Geeks

 

Method 2: Using trim() and array_map() function: 
 



  • The array_map() function is an inbuilt function in PHP which helps to modify all elements one or more arrays according to some user-defined condition in an easy manner. It basically, sends each of the elements of an array to a user-defined function and returns an array with new values as modified by that function.
    Syntax: 
     
array_map(functionName, arr1, arr2...)

Example: 
 

php




<?php
 
// Create an array with whitespace
$arr = array( "Geeks  ", "  for", "   Geeks   ");
 
// Print original array
echo "Original Array:\n";
foreach($arr as $key => $value)
    print($arr[$key] . "\n");
 
// Iterate array through array_map() function
// Using trim() function to remove all
// whitespaces from every array objects
$arr = array_map('trim', $arr);
  
// Print modify array
echo "\nModified Array:\n";
foreach($arr as $key => $value)
    print($arr[$key] . "\n");
     
?>
Output: 
Original Array:
Geeks  
  for
   Geeks   

Modified Array:
Geeks
for
Geeks

 

Method 3: Basic method using for loop: Use for loop to traverse each element of array and then use trim() function to remove all white space from array elements.
Example: 
 

php




<?php
 
// Create an array with whitespace
$arr = array( "Geeks  ", "  for", "   Geeks   ");
 
// Print original array
echo "Original Array:\n";
foreach($arr as $key => $value)
    print($arr[$key] . "\n");
  
// Print modify array
echo "\nModified Array:\n";
 
// Iterate array through for loop
// Using trim() function to remove all
// whitespaces from every array objects
foreach($arr as $key => $value) {
    $arr[$key] = trim($value);
      
    // Print current object of array
    print($arr[$key] . "\n");
}
     
?>
Output: 
Original Array:
Geeks  
  for
   Geeks   

Modified Array:
Geeks
for
Geeks

 




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