50个WordPress过滤钩子（1-10）

<?php

add_filter( 'login_errors', 'login_errors_example' );

function login_errors_example( $error ) {
    $error = '';
    return $error;
}

?>

<?php

add_filter( 'comment_post_redirect', 'comment_post_redirect_example' );

function comment_post_redirect_example( $location ) {
    return '/thanks-for-your-comment/';
}

?>

<?php

add_filter( 'allowed_redirect_hosts', 'allowed_redirect_hosts_example' );

function allowed_redirect_hosts_example( $content ) {
    $content[] = 'forum.mywebsite.com';
    $content[] = 'welcome.mywebsite.com';
    $content[] = 'help.mywebsite.com';
    return $content;
}

// Example source: http://codex.wordpress.org/Plugin_API/Filter_Reference/allowed_redirect_hosts

?>

<?php

add_filter( 'body_class', 'body_class_example' );

function body_class_example( $classes ) {
    if( is_single() ) {
        foreach( get_the_category( get_the_ID() ) as $category )
            $classes[] = 'cat-' . $category->category_nicename;
    }
    return $classes;
}

// Example source: https://codex.wordpress.org/Function_Reference/body_class#Add_Classes_By_Filters

?>

<?php

add_filter( 'locale', 'locale_example' );

function locale_example( $lang ) {
    if ( 'tr' == $_GET['language'] ) {
        return 'tr_TR';
    } else {
        return $lang;
    }
}

// Example source: http://codex.wordpress.org/Plugin_API/Filter_Reference/locale

?>

<?php

add_filter( 'sanitize_user', 'strtolower' );

// Example source: http://codex.wordpress.org/Plugin_API/Filter_Reference/sanitize_user

?>

<?php

add_filter( 'the_content', 'the_content_example' );

function the_content_example( $content ) {
    return preg_replace('/<p>\s*(<a .*>)?\s*(<img .* \/>)\s*(<\/a>)?\s*<\/p>/iU', '\1\2\3', $content);
}

// Example source: http://wpsnipp.com/index.php/functions-php/remove-p-tag-from-around-images-in-the_content/

?>

<?php

add_filter( 'the_password_form', 'the_password_form_example' );

function the_password_form_example() {
    $output  = '<form action="' . esc_url( site_url( 'wp-login.php?action=postpass', 'login_post' ) ) . '" method="post">';
    $output .= '<span>' . __( "Enter the password:" ) . ' </span>';
    $output .= '<input name="post_password" type="password" size="20" />';
    $output .= '<input type="submit" name="Submit" value="' . esc_attr__( "Go" ) . '" />';
    $output .= '</form>';
    return $output;
}

// Example source: http://codex.wordpress.org/Using_Password_Protection#Password_Form_Text

?>

<?php

add_filter( 'the_terms', 'strip_tags' );

?>

<?php

add_filter( 'wp_mail_from', 'wp_mail_from_example' );

function wp_mail_from_example( $email ) {
    return 'my.email.address@mywebsite.com';
}

?>