Example of using str_replace for AtlasFoundation ticket

atlas_foundation_gettext_membership.php

<?php
/**
 * This filter will search your codebase for translatable strings and replace when an exact match is found.
 * 
 * Add this code to your PMPro Customizations Plugin
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 *
 * @param  string $output_text     this represents the end result
 * @param  string $input_text      what is written in the code that we want to change
 * @param  string $domain          text-domain of the plugin/theme that contains the code
 *
 * @return string                  the result of the text transformation
 */
function my_gettext_membership( $output_text, $input_text, $domain ) {
	if ( 'pmprodon' === $domain ) {
		$output_text = str_replace( 'Make a Gift', 'Make a Donation', $output_text );
	}
    
    if ( 'paid-memberships-pro' === $domain ) {
        $output_text = str_replace( 'I agree to the %s', 'I agree to the <a href="/link-to-page/">%s</a>', $output_text );
    }
    
	return $output_text;
}
add_filter( 'gettext', 'my_gettext_membership', 10, 3 );