Web Development TutorialsWritten By Peter Kelly

In this tutorial we will create a function to check if a field is empty in either a string or an array. So this could be used to do a simple check on if a form field is left blank. I will show you an example on how to use it to check if a form field is empty.

So heres the function

function empty_check($var){ // Start Function
	if(is_array($var)){ // Determine if $var is an array or not
		foreach($var as $key => $value){ // If it is an array go through the array and assign to $key and $value
			$value = trim($value); // Remove any whitespace from the start and end of the value
			if(empty($value)){ // Check if its empty or not
				$empty[] = $key; // If its empty put the name of the field thats empty in $empty array.
			}
		}
	}else{ // If it isnt in an array
		$var = trim($var); // Remove any whitespace from the start and end of the value
		if(empty($var)){ // Check if its empty or not
			$empty[] = $var; // If its empty put the value into the $empty array.
		}
	}
	return $empty; // Return $empty.
}

So now we have the function I will show you an example on how you can use this.