php anti injection form submission value escape implementation details

During development, we need to take care to prevent sql injection, so we can update the data to the database only if we process the values submitted from the form accordingly
php sweeping Forces function. Any value can be passed over for conversion

function quotes($content)     
{     
    // if magic_quotes_gpc=Off ", then start dealing with it      
    if (!get_magic_quotes_gpc()) {     
        // judge $content Is it an array   
        if (is_array($content)) {     
            // if $content It's an array, so we're going to handle each of those 1 A single no      
            foreach ($content as $key=>$value) {     
                $content[$key] = addslashes($value);     
            }     
        } else {     
            // if $content Not an array, so just handle it 1 time      
            addslashes($content);     
        }     
    } else {     
        // if magic_quotes_gpc=On , then do not deal with      
    }     
    // return $content     
    return $content;

stripslashes () is used to remove backslashes
stripslashes() removes the backslash from addslashes() automatically