Why Does PHP 7 Throw a \'Fatal error: Call to undefined function mysql_connect()\' Error?

PHP Error Handling: "Fatal error: Call to undefined function mysql_connect() [duplicate]"

Question:

When attempting to connect to a MySQL database using PHP, you encounter the error message "Fatal error: Call to undefined function mysql_connect()." Despite configuring PHP, MySQL, and Apache correctly, this issue persists.

Answer:

This error typically arises when you have recently upgraded your PHP version to PHP 7. In this version, the mysql_connect() function has been deprecated. To resolve this issue:

1. Verify your PHP version:

   Use the command php -version to check your PHP version.

2. Switch to mysqli_connect():

   Replace the deprecated mysql_connect() function with its corresponding mysqli_connect() function. For example:

   $host = "127.0.0.1";
   $username = "root";
   $pass = "foobar";
   $con = mysqli_connect($host, $username, $pass, "your_database");

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3. Upgrade legacy PHP code:

   If you are working with legacy PHP code, you must upgrade all instances of mysql_ functions to mysqli_ functions.

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