I use this code to check if values exist in an array:
if (!in_array(array("Product code","Price","Supplier","Cost Price"), $data)) {
die("You are missing fields");
}
Works fine but I would like it to return the value that does not exist so if th array was this:
$data = array("Price","Supplier","Cost Price");
PHP would return "Product code is not in array"
Use array_diff to find difference in multiple arrays comparison.
$array1 = array("a" => "Product code","Price","Supplier","Cost Price");
if (!in_array($array1, $data)) {
die("You are missing :" . print_r(array_diff($array1, $data)));
}
From the PHP manual:
<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result); /* This will print: BLUE */
?>
More information here: http://php.net/manual/en/function.array-diff.php
Have a look at http://www.php.net/manual/en/function.array-diff.php and http://www.php.net/manual/en/function.array-intersect.php ; with these functions, you can check what's the difference (or common part) of two arrays and iterate through the differences (or common parts) to tell the user exactly what's missing/common.
you can use the array_diff_assoc -Computes the difference of arrays with additional index check
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>
or use in_array like
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
echo "Got Irix";
}
to check all array you can use something like
foreach($array as $val){
if (in_array($val, $os)) {
echo "Got Irix";
}
}else{
//show error
}
array_diff is clearly the better way to do this, index checks are not needed here.