array_search() : Check if given value is available inside array and returns the key if available otherwise False

array_search(): searching for value inside

This function Searches for presence of an input value.

Returns the key of matching element ( present ) , returns false if not found.

bool = array_search ($search, $input_array,$strict);

$search : Required , value to search inside the $input_array.
$input_array : Required , array inside which the value will be searched.
$strict :Optional : If set to TRUE then strict type comparison is performed.

Output is the corresponding key if value is found inside array , otherwise FALSE.

arra_search() returns the key of first occurance of the value, to get the keys of all the matching values we can use array_keys() function

Example 1

$input=array(1,2,3,4);

if(array_search(2,$input)){
echo "Value is available ";	
}else{
echo "Value is NOT available ";	
}

Output is here.

Value is available

Example 2

$input=array('One' =>1,'Two'=>2,'Three'=>3,'Four'=>'Fourth');

if(array_search('Three',$input)){
echo "Value is available ";	
}else{
echo "Value is NOT available ";	
}

Output is here.

Value is available

Example 3 , returning the matching key

$input=array('One' =>'First','Two'=>'Second','Three'=>'Third','Fourth');

$search_string='Third'; // Change this value
if(array_search($search_string,$input)){
echo "Value <i>$search_string</i> is available inside array<br>";	
echo "Marching Key is : ".array_search($search_string,$input);
}else{
echo "Value <i>$search_string</i> is NOT available inside array <br>";	
}

Output is here

Value Third is available inside array
Marching Key is : Three

More functions to search an array.

Function	Details
in_array()	Search for value inside Array. Returns TRUE or FALSE
array_key_exists()	Returns TEUE if key is found inside, FALSE otherwise
array_keys()	Array of keys for matching values, FALSE otherwise

Example 4

Here is an array of students where name of the student is key and mark is stored as value. Collect the highest and lowest mark ( values here ) along with the student names ( keys here ) . Used array_search() to collect the key ( student name )

$student=array('Ron'=>15,'Geek'=>25,'Alex'=>13,'Ravi'=>14);

echo "highest mark : ". max($student); // output 25
echo "<br>";
echo "Student got highest mark:".array_search(max($student),$student);
echo "<br>";
echo "Lowest mark : ". min($student); // output 13
echo "<br>";
echo "Student got Lowest mark:".array_search(min($student),$student);

Output is here.

highest mark : 25
Student got highest mark : Geek
Lowest mark : 13
Student got Lowest mark : Alex

Difference between arrays considering values
Array REFERENCE

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array_search(): searching for value inside

Example 1

Example 2

Example 3 , returning the matching key

Example 4

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