Home >Backend Development >PHP Tutorial >Detailed explanation of the use of PHP function in_array()
PHP has a system function is_array() that can determine whether a value is in an array.
The syntax is as follows:
in_array(value,array,type) return boolen
Parameter description:
value: the value to be searched
array: the array being searched
type: type, true congruent, false non-congruent (default)
Example 1: Normal use
Code:
$str = 1; $arr = array(1,3,5,7,9); $boolvalue = in_array($str,$arr); var_dump($boolvalue);
Execution result:
bool(true)
Example 2: Using the third parameter
Non-congruent
Code:
$str = '1'; $arr = array(1,3,5,7,9); $boolvalue = in_array($str,$arr,false); var_dump($boolvalue);
Execution result:
bool(true)
Congruent
Code:
$str = '1'; $arr = array(1,3,5,7,9); $boolvalue = in_array($str,$arr,true); var_dump($boolvalue);
Execution result:
bool(false)
Example 3: Clone object
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);
Execution result:
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);
Execution result:
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);
Execution result:
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);
Execution result:
bool(false)
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