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PHP Array Exercises : Remove a specified duplicate entry from an array

PHP Array: Exercise-44 with Solution

Write a PHP a function to remove a specified duplicate entry from an array.

Sample Solution:

PHP Code:

<?php
function array_uniq($my_array, $value) 
{ 
    $count = 0; 
    
    foreach($my_array as $array_key => $array_value) 
    { 
        if ( ($count > 0) && ($array_value == $value) ) 
        { 
            unset($my_array[$array_key]); 
        } 
        
        if ($array_value == $value) $count++; 
    } 
    
    return array_filter($my_array); 
} 
$numbers = array(4, 5, 6, 7, 4, 7, 8);

print_r(array_uniq($numbers, 7));
?>

Sample Output:

Array                                                       
(                                                           
    [0] => 4                                                
    [1] => 5                                                
    [2] => 6                                                
    [3] => 7                                                
    [4] => 4                                                
    [6] => 8                                                
)     

Flowchart:

Flowchart: PHP - Remove a specified, duplicate entry from an array

PHP Code Editor:

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Previous: Write a PHP script to merge two commas separated lists with unique value only.
Next: Write a PHP script to do a multi-dimensional difference, i.e. returns values of the first array that are not in the second 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