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List all functions hooked on a specific hook. No need to have the specific hook name, just pass one or multiple strings contained in the hook name.
<?php
/**
* Inspect/list functions called on hooks containing specific term
*
* @param array Array of terms that the hook should contain
* @return array
*/
function inspect_hooks( $terms = [ 'wp_' ] ) {
global $wp_filter;
$related_hooks = [];
$total = 0;
if ( ! is_array( $terms ) ) {
$terms = [ $terms ];
}
foreach ( $wp_filter as $key => $val ) {
if ( string_contains_all_words( $key, $terms ) ) {
foreach ( $val->callbacks as $priority ) {
foreach ( $priority as $callback ) {
foreach ( $callback as $function => $function_data ) {
if ( $function !== 'function' ) {
continue;
}
if ( is_array( $function_data ) ) {
$method = $function_data[1];
if ( is_string( $function_data[0] ) ) {
$classname = $function_data[0];
} else {
$classname = get_class( $function_data[0] );
}
if ( method_exists( $function_data[0], $method ) ) {
$reflection = new \ReflectionMethod( $classname, $method );
$function_name = $classname . '->' . $method;
$related_hooks[ $key ][] = sprintf( '<strong>%1$s</strong> in <em>%2$s</em> <small>L%3$d</small>', $function_name, str_replace( ABSPATH, '', $reflection->getFileName() ), $reflection->getStartLine() );
} else {
$function_name = $classname . '->' . $method;
$related_hooks[ $key ][] = sprintf( '<strong>%1$s</strong> (method not found)', $function_name );
}
} else {
$reflection = new \ReflectionFunction( $function_data );
if ( $function_data instanceof \Closure ) {
$related_hooks[ $key ][] = sprintf( 'closure in <em>%1$s</em> <small>L%2$d</small>', str_replace( ABSPATH, '', $reflection->getFileName() ), $reflection->getStartLine() );
} else {
$related_hooks[ $key ][] = sprintf( '<strong>%3$s</strong> in <em>%1$s</em> <small>L%2$d</small>', str_replace( ABSPATH, '', $reflection->getFileName() ), $reflection->getStartLine(), $function_data );
}
}
$total++;
}
}
}
}
}
$related_hooks['total'] = $total;
return $related_hooks;
}
/**
* Check if a string contains ALL words from an array
*
* @param array $array Array of strings
* @return boolean
*/
function string_contains_all_words( $string, $array ) {
$missed = false;
foreach ( $array as $word ) {
if ( strpos( $string, $word ) !== false ) {
continue;
} else {
$missed = true;
break;
}
}
return ! $missed;
}
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