Solution to PHP Fatal error: Call to undefined function imap_open()

When using PHP to write email-related programs, you may encounter the following error message:

PHP Fatal error: Call to undefined function imap_open()

This error message is usually due to This is caused by the PHP imap extension not being loaded correctly or not installed. In order to solve this problem, we can follow the steps below.

1. Confirm whether the imap extension is installed

Use the phpinfo() function to check whether the imap extension has been installed in the current server. We can add the following content to the code to view:

phpinfo();
?>

After opening in the browser, you can use Ctrl FSearch for "imap" to see if there is information about this extension. If not, it means it is not installed.

2. Install imap extension

Next, we need to install the imap extension on the server.

On Linux systems, you can use the following command to install:

sudo apt-get install php7.0-imap

or

sudo yum install php-imap

On Windows systems, you can uncomment the following lines in the php.ini file and remove the preceding semicolon:

extension=php_imap.dll

Then restart the server.

3. Confirm whether the imap extension is loaded

If the imap extension has been installed but an error message still appears, it may be that the extension has not been loaded correctly.

Use the phpinfo() function to check and confirm whether the imap extension has been loaded. Open the phpinfo() page in the browser, press Ctrl F and search for "imap" to see if it has been loaded.

If it is not loaded, you need to add the following configuration to the php.ini file:

extension=imap

Then restart the server.

Summary

The above is the method to solve the error "PHP Fatal error: Call to undefined function imap_open()". It mainly includes confirming whether the imap extension is installed, installing the imap extension and confirming whether the imap extension is loaded.

Before running mail-related programs, you need to confirm whether the imap extension has been installed and loaded correctly. If you encounter the above error message, you need to check and repair it according to the above method.

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