How to trim all strings in an array in PHP ?
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 arrayecho "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($val);')); // Print modify arrayecho "\nModified Array:\n";foreach($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 arrayecho "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', $arr); // Print modify arrayecho "\nModified Array:\n";foreach($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 arrayecho "Original Array:\n";foreach($arr as $key => $value) print($arr[$key] . "\n"); // Print modify arrayecho "\nModified Array:\n";// Iterate array through for loop// Using trim() function to remove all// whitespaces from every array objects foreach($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
