advanced.php

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<?php
// the output:page hook is triggered by elgg_view_page().
elgg_register_plugin_hook_handler('output', 'page', 'example_plugin_hook_handler', 600);
elgg_register_plugin_hook_handler('output', 'page', 'example_plugin_hook_handler_2', 601);
 
function example_plugin_hook_handler($hook, $type, $value, $params) {
    // change a to @
    $value = str_replace('a', '@', $value);
 
    return $value;
}
 
function example_plugin_hook_handler_2($hook, $type, $value, $params) {
    // change S to $
    $value = str_replace('S', '$', $value);
 
    return $value;
}
 
$content = 'This is some Sample Content.';
 
echo elgg_view_page('Title', $content);