PHP Casting

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PHP Cast to String

<pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = "hello"; // String
$d = true;    // Boolean
$e = NULL;    // NULL

$a = (string) $a;
$b = (string) $b;
$c = (string) $c;
$d = (string) $d;
$e = (string) $e;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
?> 
</pre>

Example 1

Result View Example

PHP Cast to Integer

<h2>Cast_to_Integer</h2>
<p>From w3schools.com, Experiment by Teeratus_R </p>
<pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = "25 kilometers"; // String
$d = "kilometers 25"; // String
$e = "hello"; // String
$f = true;    // Boolean
$g = NULL;    // NULL

$a = (int) $a;
$b = (int) $b;
$c = (int) $c;
$d = (int) $d;
$e = (int) $e;
$f = (int) $f;
$g = (int) $g;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
var_dump($f);
var_dump($g);
?> 
</pre>

Example 2

Result View Example

PHP Cast to Float

<h2>Cast to Float</h2>
        <p>To cast to float, use the (float) statement: </p>
        <pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = "25 kilometers"; // String
$d = "kilometers 25"; // String
$e = "hello"; // String
$f = true;    // Boolean
$g = NULL;    // NULL

$a = (float) $a;
$b = (float) $b;
$c = (float) $c;
$d = (float) $d;
$e = (float) $e;
$f = (float) $f;
$g = (float) $g;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
var_dump($f);
var_dump($g);
?> 
</pre>

Example 3

Result View Example

PHP Cast to Boolean

<h2>Cast_to_Boolean</h2>
        <p>From w3schools.com, Experiment by Teeratus_R </p>
        <pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = 0;       // Integer
$d = -1;      // Integer
$e = 0.1;     // Float
$f = "hello"; // String
$g = "";      // String
$h = true;    // Boolean
$i = NULL;    // NULL

$a = (bool) $a;
$b = (bool) $b;
$c = (bool) $c;
$d = (bool) $d;
$e = (bool) $e;
$f = (bool) $f;
$g = (bool) $g;
$h = (bool) $h;
$i = (bool) $i;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
var_dump($f);
var_dump($g);
var_dump($h);
var_dump($i);
?> 
</pre>

Example 4

Result View Example

PHP Cast to Array

<h2>Cast_to_Array</h2>
        <p>To cast to array, use the (array) statement:</p>
        <pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = "hello"; // String
$d = true;    // Boolean
$e = NULL;    // NULL

$a = (array) $a;
$b = (array) $b;
$c = (array) $c;
$d = (array) $d;
$e = (array) $e;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
?> 
</pre>

Example 5

Result View Example

PHP Converting Objects into Arrays

<h2>Converting_Objects_into_Arrays</h2>

<pre>
<?php
class Car {
  public $color;
  public $model;
  public function __construct($color, $model) {
    $this->color = $color;
    $this->model = $model;
  }
  public function message() {
    return "My car is a " . $this->color . " " . $this->model . "!";
  }
}

$myCar = new Car("red", "Volvo");

$myCar = (array) $myCar;
var_dump($myCar);?> 
</pre>

Example 6

Result View Example

PHP Cast to Object

<h2>Cast_to_Object</h2>
        <p>To cast to object, use the (object) statement: </p>
        <pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = "hello"; // String
$d = true;    // Boolean
$e = NULL;    // NULL

$a = (object) $a;
$b = (object) $b;
$c = (object) $c;
$d = (object) $d;
$e = (object) $e;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
?> 
</pre>

Example 7

Result View Example

PHP Converting Arrays into Objects

<h2>Converting_Arrays_into_Objects</h2>
        
<pre>
<?php
$a = array("Volvo", "BMW", "Toyota"); // indexed array
$b = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43"); // associative array

$a = (object) $a;
$b = (object) $b;

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
?> 
</pre>

Example 8

Result View Example

PHP Cast to NULL

<h2>Cast to NULL</h2>
<p>To cast to NULL, use the (unset) statement:</p>
<pre>
<?php
$a = 5;       // Integer
$b = 5.34;    // Float
$c = "hello"; // String
$d = true;    // Boolean
$e = NULL;    // NULL

unset($a);
unset($b);
unset($c);
unset($d);
unset($e);

//To verify the type of any object in PHP, use the var_dump() function:
var_dump($a);
var_dump($b);
var_dump($c);
var_dump($d);
var_dump($e);
?>
</pre>

Example 9

Result View Example

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