How to check two arrays in one foreach loop? - php

Question

How do I check if any of the keys in foreach loop exists in another array's value ?
Array 1 I want to check
$array1 = array(
'a' => '1',
'b' => '2',
'c' => '3',
);
And the Array 2 which Array 1 should be compared to
$reserved_words = array('b');
What I want is to check whether the conditional check is TRUE to apply specific actions. My code looks like this now:
foreach( $array1 as $key => $value )
{
// Check for reserved words
if( in_array($key, $reserved_words)
{
// Some action
}
// Code...
}
I can't find anything similiar to array_key_exists, probably I am missing something.
I want to check it by simply doing this:
if( array_value_exists($value, $reserved_words) )
But the problem is that no array_value_exists function is available.

Answer 1

You forgot first the as keyword in your foreach header and you missed a ) in your if statement.
So this should work:
<?php
$array1 = array(
'a' => '1',
'b' => '2',
'c' => '3',
);
$reserved_words = array('b');
foreach( $array1 as $key => $value ) {
//^^Here 'as' keyword
if( in_array($key, $reserved_words)) {
echo $key; //^Here ')' closed if statement
}
}
?>

Answer 2

$array1 = array(
'a' => '1',
'b' => '2',
'c' => '3',
);
$reserved_words = array('b');
>>> array_intersect_key($array1, array_flip($reserved_words));
=> [
"b" => "2"
]

Answer 3

you are missing the 'as' keyword. Please put the code like below
foreach($array1 as $key => $val){
if(in_array($key, $reserved_words)){
echo "yes";
} else {
echo "no";
}
}