PHP in_array 不工作或工作奇怪

Question

Sorry for my bad English, but i have problem which i cant solve. I have arrays which contains arrays with key "tags" (i will call it tag-array).In some tag-arrays are same values so i want create one array which will contain values from tag-arrays without repetition.

list of values i have in tag-arrays:

=================
php
bootstrap
html
css
=================
php
=================
bootstrap
=================
laravel
=================
php

Example of array which contain tag-array:

        Array
    (
        [0] => Array
            (
                [id] => 5
                [project_name] => Something 5
                [info_1] => Some test information 1
                [tags] => Array
                    (
                        [0] => php 
                        [1] =>  html 
                        [2] =>  bootstrap 
                        [3] =>  css
                    )
                [img_1] => 1.jpg
            )
         [1] => Array(...)
         [2] => Array(...)
         [3] => Array(...)
         [4] => Array(...)
}

What i did to make new sorted array:

public function sortTags($data){
        $works_number = $this->getCountWorks(); //count arrays
        $new_arr =  array();
        for($i=0; $i < $works_number; $i++){
            foreach ($data[$i]['tags'] as $key => $val) {
                if(!in_array($val, $new_arr)){
                    array_push($new_arr, $val);
                }
            }
        }
        echo "Debug : <br /> <pre>";
        print_r($new_arr);
        echo "<pre>";
    }

What expected:

Array
(
    [0] => php 
    [1] =>  html 
    [2] =>  bootstrap 
    [3] =>  css
    [6] => laravel
)

Real resault (take a look that i have one more array where is also "php" but function sorted it and didn't write):

Array
(
    [0] => php 
    [1] =>  html 
    [2] =>  bootstrap 
    [3] =>  css
    [4] => php
    [5] => bootstrap
    [6] => laravel
)

So why my fucntion dont do what i want (and how fix it) and why function SORTED LAST ELEMENT?

Answer 1

Your code didn't work because you have whitespace around some of the tags. You need to trim () them before pushing them into the array. If you want them sorted, you need to call sort() on the array.

public function sortTags($data){
    $works_number = $this->getCountWorks(); //count arrays
    $new_arr =  array();
    for($i=0; $i < $works_number; $i++){
        foreach ($data[$i]['tags'] as $key => $val) {
            $val = trim($val);
            if(!in_array($val, $new_arr)){
                array_push($new_arr, $val);
            }
        }
    }
    sort($new_arr);
    echo "Debug : <br /> <pre>";
    print_r($new_arr);
    echo "<pre>";
}