Explanation of PHP Function in_array of

PHP has a system function is_array () that determines whether a value is in an array.
The syntax is as follows:

in_array(value,array,type)

return boolen

Parameter description:
value: Value to search for
array: Array Searched
type: Type, true congruent, false non-congruent (default)

Example 1: General use

Code:

$str = 1;

 

$arr = array(1,3,5,7,9);

 

$boolvalue = in_array($str,$arr);

 

var_dump($boolvalue);

Implementation results:

bool(true) 

Example 2: Using the third parameter
Non-congruence
Code:

$str = '1';

 

$arr = array(1,3,5,7,9);

 

$boolvalue = in_array($str,$arr,false);

 

var_dump($boolvalue);

Implementation results:

bool(true) 

Congruent
Code:

$str = '1';

 

$arr = array(1,3,5,7,9);

 

$boolvalue = in_array($str,$arr,true);

 

var_dump($boolvalue);

Implementation results:

bool(false) 

Example 3: Cloning Objects
Code:

class a {

    public $a = 1;  

    public function fun(){

        return $this->a; 

    }

}

 

class b {

    public $a = 2;  

    public function fun(){

        return $this->a; 

    }

}

 

$a = new a();

$b = new b();

 

$c = clone $a;

 

$arr = array($a,$b);

 

$boolvalue = in_array($c,$arr,false);

 

var_dump($boolvalue);

Implementation results:

bool(true) 

Code:

class a {

    public $a = 1;  

    public function fun(){

        return $this->a; 

    }

}

 

class b {

    public $a = 2;  

    public function fun(){

        return $this->a; 

    }

}

 

$a = new a();

$b = new b();

 

$c = clone $a;

 

$arr = array($a,$b);

 

$boolvalue = in_array($c,$arr,true);

 

var_dump($boolvalue);

Implementation results:

bool(false) 

Example 4: Multidimensional Array
Code:

$str = 10;

 

$arr = array(

    array(1,2,3,4),

    array(5,6,7,8,9),

    10

);

 

$boolvalue = in_array($str,$arr);

 

var_dump($boolvalue);

Implementation results:

bool(true) 

Code:

$str = 10;

 

$arr = array(

    array(1,2,3,4),

    array(5,6,7,8,9,10),

);

 

$boolvalue = in_array($str,$arr);

 

var_dump($boolvalue);

Implementation results:

bool(false)