Using WordPress ‘iis7_rewrite_rule_exists()’ PHP function

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The iis7_rewrite_rule_exists() WordPress PHP function checks if a rewrite rule for WordPress already exists in the IIS 7+ configuration file.

Usage

iis7_rewrite_rule_exists($filename);

Example:

// Check if the rewrite rule exists in the web.config file
$filename = ABSPATH . 'web.config';
$rule_exists = iis7_rewrite_rule_exists($filename);
echo $rule_exists ? 'Rule exists' : 'Rule does not exist';

Parameters

  • $filename (string) – The file path to the IIS 7+ configuration file.

More information

See WordPress Developer Resources: iis7_rewrite_rule_exists()

Examples

Basic usage

Check if the rewrite rule exists in the web.config file and display the result.

$filename = ABSPATH . 'web.config';
$rule_exists = iis7_rewrite_rule_exists($filename);
echo $rule_exists ? 'Rule exists' : 'Rule does not exist';

Create a rewrite rule if it doesn’t exist

Check if the rewrite rule exists, and if not, create one.

$filename = ABSPATH . 'web.config';
if (!iis7_rewrite_rule_exists($filename)) {
    // Code to create rewrite rule
}

Display a custom message based on the rule existence

Check if the rewrite rule exists and display a custom message accordingly.

$filename = ABSPATH . 'web.config';
$rule_exists = iis7_rewrite_rule_exists($filename);
$message = $rule_exists ? 'Everything is set up correctly' : 'Please create the rewrite rule';
echo $message;

Backup the configuration file before updating

Check if the rewrite rule exists, backup the configuration file, and update it if necessary.

$filename = ABSPATH . 'web.config';
if (!iis7_rewrite_rule_exists($filename)) {
    // Code to backup the configuration file
    // Code to create rewrite rule
}

Log the rule check result

Check if the rewrite rule exists and log the result.

$filename = ABSPATH . 'web.config';
$rule_exists = iis7_rewrite_rule_exists($filename);
error_log($rule_exists ? 'Rule exists in web.config' : 'Rule does not exist in web.config');