Definition
PHP in_array() is an inbuilt PHP function which is used to check if a specific value exists in an Array or not.
Syntax
in_array ($value, $array, $type)
Parameters
| Parameter | Type | Description |
|
$value (mandatory) |
Integer,string, float,boolean etc |
It is the specific value to be searched in array Note: If this parameter is array type then the search performed will be case sensitive |
| $array (mandatory) | array | It is the array name in which search will be performed |
| $type (optional) | boolean |
If this parameter is set TRUE than the in_array() function searches for the same type of value specified in the '$value' parameter. The default value of this parameter is false |
Return Value
PHP in_array() function returns TRUE if the $value is found in the array and FALSE if the $value is not found in the array.
Example of in_array Function in PHP
Example 1
<?
#PHP program to illustrate the working of in_array Function in PHP
#Simple program - 1
//Array variable of Cars Brands
$carBrands = array('Maruti','Honda','Hyundai','Tata','Ford');
//Variable to store the return result of in_array function
$marutiCar = in_array('Maruti', $carBrands);
//Checking the return result is true or false.
/* NOTE: in_array returns the 0 (For False) or 1 (For True)*/
if($marutiCar == 1){
echo "Brand Maruti is available";
}else{
echo "Brand Maruti not found";
}
?>
OUTPUT:
Brand Maruti is available
Example 2
<?
#PHP program to illustrate the working of in_array Function of PHP
#Simple program - 2
//Array variable of Cars Brands
$carBrands = array('Maruti','Honda','Hyundai','Tata','Ford');
//Conditional loop with in_array function
/*
In this Conditional Loop we checking , Is returned
Result is 1 or not
*/
if(in_array("Honda", $carBrands)){
echo "Brand Found";
}else{
echo "Brand not Found";
}
?>
OUTPUT
Brand Found
Example 3: Strict Mode
<?
#PHP program to illustrate the working of in_array Function of PHP
#Advance Example / Strict Mode
//Array of prices
$carPriceInLakhs = array(2.5,4.5,3.0,3,24,56,29,1,0.7,"34");
#Conditional Statement
/*
First Statement :
{
In this Statement we are checking, Is 2.4 is available in our array
and Boolean TRUE is checking, Is 2.4 needle has the same data type in
the array or not.
If Yes, It will run the block for this statement
}
Second Statement :
{
In this Statement we are checking, Is 24 is available in our array
and Boolean TRUE is checking, Is 24 needle has the same data type in
the array or not.
As we can see 24 is available in the array but it the different data-
type so, It will not run the block for this statement.
}
*/
if(in_array(2.5,$carPriceInLakhs,TRUE)){
echo "Cars available in 2.5 Lakhsn";
}else if(in_array("24",$carPriceInLakhs,True)){
echo "Cars not available in 24 Lakhsn";
}else{
echo "Cars not available in this pricen";
}
?>
OUTPUT
Cars available in 2.5 Lakhs