What is the difference between using isset($_POST) and isset($_POST['page_img']) in PHP?

When using isset($_POST), you are checking if any POST data has been submitted, while isset($_POST['page_img']) specifically checks if the 'page_img' key has been set in the POST data. Therefore, using isset($_POST) will return true if any POST data is present, regardless of its content, while isset($_POST['page_img']) will only return true if 'page_img' key is present. 

// Check if any POST data has been submitted
if(isset($_POST)) {
    // Process the POST data
}

// Check if 'page_img' key is present in the POST data
if(isset($_POST['page_img'])) {
    // Process the 'page_img' data
}

Keywords

isset $_POST page_img PHP difference

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