How to trim white spaces of array values in php

Question

I have an array as follows

$fruit = array(\'  apple \',\'banana   \', \' , \',     \'            cranberry \');

I want an array which conta

Answer 1

function generateRandomString($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charactersLength = strlen($characters);
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, $charactersLength - 1)];
    }
    return $randomString;
}

function generateRandomSpaces() {
    $output = '';
    $i = rand(1, 10);
    for ($j = 0; $j <= $i; $j++) {
        $output .= " ";
    }   

    return $output;
}

// Generating an array to test
$array = [];
for ($i = 0; $i <= 1000; $i++) {
    $array[] = generateRandomSpaces() . generateRandomString(10) . generateRandomSpaces(); 
}

// ARRAY MAP
$start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    $trimmed_array=array_map('trim',$array);
}
$time = (microtime(true) - $start);
echo "Array map: " . $time . " seconds\n";

// ARRAY WALK
$start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    array_walk($array, 'trim');
}
$time = (microtime(true) - $start);
echo "Array walk    : " . $time . " seconds\n"; 

// FOREACH
$start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    foreach ($array as $index => $elem) {
        $array[$index] = trim($elem);
    }
}
$time = (microtime(true) - $start);
echo "Foreach: " . $time . " seconds\n";

// FOR
$start = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    for ($j = 0; $j < count($array) - 1; $j++) { 
        $array[$j] = trim($array[$j]);
    }
}
$time = (microtime(true) - $start);
echo "For: " . $time . " seconds\n";

The output of the code above is:

Array map: 8.6775720119476 seconds
Array walk: 10.423238992691 seconds
Foreach: 7.3502039909363 seconds
For: 9.8266389369965 seconds

This values of course may change but I would say foreach is the best option.

Answer 2

function trimArray(&$value) 
{ 
    $value = trim($value); 
}
$pmcArray = array('php ','mysql ', ' code ');
array_walk($pmcArray, 'trimArray');

by using array_walk function, we can remove space from array elements and elements return the result in same array.

Answer 3

I had trouble with the existing answers when using multidimensional arrays. This solution works for me.

if (is_array($array)) {
    foreach ($array as $key => $val) {
        $array[$key] = trim($val);
    }
}

Answer 4

$fruit= array_map('trim', $fruit);

Answer 5

array_map and trim can do the job

$trimmed_array = array_map('trim', $fruit);
print_r($trimmed_array);

Answer 6

array_map('trim', $data) would convert all subarrays into null. If it is needed to trim spaces only for strings and leave other types as it is, you can use:

$data = array_map(
    function ($item) {
        return is_string($item) ? trim($item) : $item;
    },
    $data
);