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PHP Array Exercises : Filter a multi-dimensional array and get those items that will match with the specified value

PHP Array: Exercise-52 with Solution

Write a PHP function to filter a multi-dimensional array. The function will return those items that will match with the specified value.

Sample Solution:

PHP Code:

<?php
    function array_filter_by_value($my_array, $index, $value)
    { 
        if(is_array($my_array) && count($my_array)>0)  
        { 
            foreach(array_keys($my_array) as $key){ 
                $temp[$key] = $my_array[$key][$index]; 
                 
                if ($temp[$key] == $value){ 
                    $new_array[$key] = $my_array[$key]; 
                } 
            } 
          } 
      return $new_array; 
    } 
$colors = array( 
   0 => array('key1' => 'Red', 'key2' => 'Green', 'key3' => 'Black'), 
   1 => array('key1' => 'Yellow', 'key2' => 'White', 'key3' => 'Pink') 
); 
$results = array_filter_by_value($colors, 'key2', 'White');     
print_r($results);      
?>

Sample Output:

Array                                                       
(                                                           
    [1] => Array                                            
        (                                                   
            [key1] => Yellow                                
            [key2] => White                                 
            [key3] => Pink                                  
        )                                                   
                                                            
) 

Flowchart:

Flowchart: PHP - Filter a multi-dimensional array which is return those items that will match with specified value

PHP Code Editor:

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Previous: Write a PHP program to filter out some array elements with certain key-names.
Next: Write a PHP script to delete a specific value from an array using array_filter() function.

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PHP: Tips of the Day

Convert a PHP object to an associative array

Just typecast it

$array = (array) $yourObject;

From Arrays:

If an object is converted to an array, the result is an array whose elements are the object's properties. The keys are the member variable names, with a few notable exceptions: integer properties are unaccessible; private variables have the class name prepended to the variable name; protected variables have a '*' prepended to the variable name.These prepended values have null bytes on either side.

Example: Simple Object

$object = new StdClass;
$object->foo = 1;
$object->bar = 2;

var_dump( (array) $object );

Output:

array(2) {
  'foo' => int(1)
  'bar' => int(2)
}

Example: Complex Object

class Foo
{
    private $foo;
    protected $bar;
    public $baz;

    public function __construct()
    {
        $this->foo = 1;
        $this->bar = 2;
        $this->baz = new StdClass;
    }
}

var_dump( (array) new Foo );

Output (with \0s edited in for clarity):

array(3) {
  '\0Foo\0foo' => int(1)
  '\0*\0bar' => int(2)
  'baz' => class stdClass#2 (0) {}
}

Output with var_export instead of var_dump:

array (
  '' . "\0" . 'Foo' . "\0" . 'foo' => 1,
  '' . "\0" . '*' . "\0" . 'bar' => 2,
  'baz' =>
  stdClass::__set_state(array(
  )),
)

Typecasting this way will not do deep casting of the object graph and you need to apply the null bytes (as explained in the manual quote) to access any non-public attributes. So this works best when casting StdClass objects or objects with only public properties. For quick and dirty (what you asked for) it's fine.

Also see this in-depth blog post:

  • Fast PHP Object to Array conversion

Ref : https://bit.ly/3fqiV2E