Solution to PHP Fatal error: Uncaught Error: Call to undefined function imap_search()

When using PHP for email service-related development, you may encounter the error "PHP Fatal error: Uncaught Error: Call to undefined function imap_search()". The reason for this error is that PHP did not find the Imap extension library, resulting in the inability to call the imap_search() function.

So, how to solve this problem? Below are the detailed steps for the workaround.

1. Confirm whether the Imap extension library is enabled

The first step is to confirm whether the Imap extension library has been enabled. We can find the line ";extension=php_imap.dll" in the php.ini file, delete the semicolon, and restart the PHP server to open the Imap extension library.

If you are using PHP on a Linux system, then you need to run the following command in the terminal to install the Imap extension library:

sudo apt-get install php-imap

2. Install Imap extension library

If you confirm that the Imap extension library is not enabled, or the above steps do not solve the problem, then you need to manually install the Imap extension library.

On Windows systems, you can go to php.net to download the Imap extension library that matches the current operating system and PHP version, and install it according to the prompts.

On Linux systems, you can execute the following command in the terminal to install the Imap extension library:

sudo apt-get install php7.x-imap

Among them, x represents the PHP version number you are currently using.

3. Add the Imap extension library to the php.ini file

Whether you are on Windows or Linux, after you install the Imap extension library, you still need to It needs to be added to the php.ini file manually. Open the php.ini file, find the "extension_dir" line, and modify it to the following content:

extension_dir = "The directory where your Imap extension library is located"

Add the following content below this line:

extension=php_imap.dll

If you are using a Linux system, you need to execute the following command:

echo 'extension=imap.so' >> /etc /php/7.x/mods-available/imap.ini
ln -s /etc/php/7.x/mods-available/imap.ini /etc/php/7.x/cli/conf.d /20-imap.ini
ln -s /etc/php/7.x/mods-available/imap.ini /etc/php/7.x/fpm/conf.d/20-imap.ini

Among them, x represents the PHP version number you are currently using.

4. Restart the PHP server

After completing the above steps, you need to restart the PHP server for the changes to take effect. On Windows systems, you can find the PHP server in system services, right-click and select "Restart". On a Linux system, you can execute the following command:

sudo service php7.x-fpm restart

Summary

The Imap extension library is important for implementing email-related functions in PHP extension, but due to historical reasons, some PHP versions and operating systems do not enable this extension by default. At this time, we need to manually enable the Imap extension library, or install the library and add it to the php.ini file to use PHP mail-related functions normally.

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