How can I check if a value is already in an array?

If i wish to check whether a value is already stored in an array or not
Then how can i chekc that? Is this any function is there in php?

 

Use in_array()

<?php
$color_array = array("blue", "red", "orange");

if (in_array("black", $color_array)){
  echo("Black exists in color array");
}
else{
  echo("Black does not exists in color array");
}
?>

PHP:

 

that right, use in_array method.

 

in_array , ​ it is

 

in_array is fine for regular sites. However, it is more efficient to use isset. Sometimes much more efficient when you enter into thousands/millions of elements.

The reason isset is more efficient than is_array is that it does not loop through each element to check if it exists, but rather does direct address check.

<?php
$colorArray = array('blue', 'red', 'orange');

if ( isset($colorArray['black']) ) {
  echo 'Black exists in color array';
} else {
  echo 'Black does not exists in color array';
}

PHP:

 

The code you've posted isn't relevant at all. To borrow from php.net:

So in this instance, if using on an array, you'd basically be checking if a value exists for an array key. isset($colorArray['blue']) would return false, as it isn't set - though isset($colorArray[0]) would return true, since $colorArray[0] is set, and it has a value of 'blue'.

 

Here are some working examples: php.net/in_array

 

Yep, you are correct. I was thinking of array_key_exists, not in_array.