How-to articles, tricks, and solutions about PHP

You can use the ON DUPLICATE KEY UPDATE statement in your MySQL query when using PHP's mysqli or PDO libraries to accomplish this.

In PHP, you can use the built-in function "nl2br" to convert newline characters to HTML line breaks in emails.

You can use the preg_replace() function in PHP to only allow numbers in a string using a regular expression.

You can use the following regular expression to extract the YouTube video ID from a URL:

You can use the strstr() function in PHP to remove all characters before a specific string.

To resize an image on upload in PHP, you can use the getimagesize function to determine the dimensions of the image, then use the imagecreatetruecolor function to create a new image with the desired dimensions.

To return JSON from a PHP script to a jQuery AJAX call, you can use the json_encode() function in PHP to convert an array or object into a JSON string.

PHP sessions can be shared across subdomains by setting the session cookie's domain to the top-level domain.

The "SameSite=Strict" attribute is a security feature that can be added to a cookie when using the PHP setcookie() function.

In PHP, you can use the "usort" function to sort an array by a specific value of a subarray.

To check if a string contains another string in PHP, you can use the strpos() function.

You can use the DateTime object in PHP to subtract one month from a date formatted with date('m-Y').

There are several UML generators available for PHP, including:

It is possible to use the gettext function inside a heredoc string in PHP.

Yes, that is one way to output the value of a PHP variable in HTML.

This error message usually indicates that a PHP module is being included more than once in a PHP script.

PHP_SELF, PATH_INFO, SCRIPT_NAME, and REQUEST_URI are all superglobal variables in PHP that provide information about the current URL being requested.

There are a few things you can try to troubleshoot this issue:

There are a few different ways to extract text within parentheses in PHP, depending on the specific requirements of your use case.

You can use the array_diff function in PHP to compare two arrays and check if the first array contains all of the values from the second array.

To get the file creation date in PHP, you can use the filectime() function.

You can use the addCData() method of the SimpleXMLElement class to add a CDATA section to an XML element.

In PHP, you can use the $_SERVER['HTTPS'] variable to check whether the current page is being served over HTTPS.

To limit the number of iterations in a foreach loop in PHP, you can use a simple counter variable and a break statement.

The error message typically occurs when the PHP script is trying to move an uploaded file from its temporary location to a new destination.