Whatever you do, make sure not to trust data sent from the client. $_SERVER[‘REMOTE_ADDR’] contains the real IP address of the connecting party. That is the most reliable value you can find. However, they can be behind a proxy server in which case the proxy may have set the $_SERVER[‘HTTP_X_FORWARDED_FOR’], but this value is easily … Read more
There are require and include_once as well. So your question should be… When should I use require vs. include? When should I use require_once vs. require The answer to 1 is described here. The require() function is identical to include(), except that it handles errors differently. If an error occurs, the include() function generates a … Read more
PHP 8.0 and higher Since PHP 8.0 you can use the str_starts_with Manual and str_ends_with Manual Example echo str_starts_with($str, ‘|’); PHP before 8.0 function startsWith( $haystack, $needle ) { $length = strlen( $needle ); return substr( $haystack, 0, $length ) === $needle; } function endsWith( $haystack, $needle ) { $length = strlen( $needle ); if( … Read more
Have a look at wkhtmltopdf . It is open source, based on webkit and free. We wrote a small tutorial here. EDIT( 2017 ): If it was to build something today, I wouldn’t go that route anymore. But would use http://pdfkit.org/ instead. Probably stripping it of all its nodejs dependencies, to run in the browser.
This always works for me: ini_set(‘display_errors’, ‘1’); ini_set(‘display_startup_errors’, ‘1’); error_reporting(E_ALL); However, this doesn’t make PHP to show parse errors – the only way to show those errors is to modify your php.ini with this line: display_errors = on (if you don’t have access to php.ini, then putting this line in .htaccess might work too): php_flag … Read more
Short Answer Use $this to refer to the current object. Use self to refer to the current class. In other words, use $this->member for non-static members, use self::$member for static members. Full Answer Here is an example of correct usage of $this and self for non-static and static member variables: <?php class X { private … Read more
foreach supports iteration over three different kinds of values: Arrays Normal objects Traversable objects In the following, I will try to explain precisely how iteration works in different cases. By far the simplest case is Traversable objects, as for these foreach is essentially only syntax sugar for code along these lines: foreach ($it as $k … Read more
Native XML Extensions I prefer using one of the native XML extensions since they come bundled with PHP, are usually faster than all the 3rd party libs and give me all the control I need over the markup. DOM The DOM extension allows you to operate on XML documents through the DOM API with PHP … Read more
Now with PHP 8 you can do this using str_contains: if (str_contains(‘How are you’, ‘are’)) { echo ‘true’; } RFC Before PHP 8 You can use the strpos() function which is used to find the occurrence of one string inside another one: $a=”How are you?”; if (strpos($a, ‘are’) !== false) { echo ‘true’; } Note … Read more
The MySQL extension: Is not under active development Is officially deprecated as of PHP 5.5 (released June 2013). Has been removed entirely as of PHP 7.0 (released December 2015) This means that as of 31 Dec 2018 it does not exist in any supported version of PHP. If you are using a version of PHP … Read more