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PHP Array Exercises : Delete an element from an array

PHP Array: Exercise-4 with Solution

$x = array(1, 2, 3, 4, 5);
Delete an element from the above array. After deleting the element, integer keys must be normalized.

Sample Solution:

PHP Code:

<?php
 $x = array(1, 2, 3, 4, 5);
 var_dump($x);
 unset($x[3]);
 $x = array_values($x);
 echo '
';
var_dump($x);
?>

Sample Output:

array(5) {                                                  
  [0]=>                                                     
  int(1)                                                    
  [1]=>                                                     
  int(2)                                                    
  [2]=>                                                     
  int(3)                                                    
  [3]=>                                                     
  int(4)                                                    
  [4]=>                                                     
  int(5)                                                    
}                                                           
array(4) {                                                  
  [0]=>                                                     
  int(1)                                                    
  [1]=>                                                     
  int(2)                                                    
  [2]=> 
  int(3)                                                    
  [3]=>                                                     
  int(5)                                                    
} 

Flowchart:

Flowchart: Delete an element from an array

PHP Code Editor:

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Previous: Create a PHP script which displays the capital and country name from the specified array $ceu. Sort the list by the name of the capital.
Next: Write a PHP script to get the first element of the specified array.

What is the difficulty level of this exercise?



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