当cart页面加载时，我会遇到此错误（插件设计为仅适用于cart页面）：
致命错误：无法重新声明custom\\u cart\\u min\\u qty（）（以前在中声明
/home/platne/serwer24774/public_html/staging/wp-content/plugins/my-plugin-slug/my-plugin-slug.php:199) in
/home/platne/serwer24774/public_html/staging/wp-content/plugins/my-plugin-slug/my-plugin-slug.php on line 199
看起来我的代码执行了两次。我如何才能以正确的方式阻止它，而不只是检查函数是否已定义？它是否与我在页面加载时创建新的类实例有关？
我编辑了一些不相关的行和描述，使这段长代码更易于检查，提到的函数现在位于不同的行中。
acau_setting_2 是设置页面复选框值，如果选中，会导致custom_cart_min_qty() 要执行的函数。
<?php
// If this file is called directly, abort.
if ( ! defined( \'WPINC\' ) ) {
die;
}
// Create settings class.
class my_plugin_name_settings
{
private $options;
private $settings_page_name;
private $settings_menu_name;
public function __construct()
{
$this->settings_page_name = \'my-plugin-slug\';
$this->settings_menu_name = \'My Plugin Name\';
// Initialize and register settings.
add_action( \'admin_init\', array( $this, \'register_settings\' ) );
// Add settings page.
add_action( \'admin_menu\', array( $this, \'add_settings_page\' ) );
// Add settings link to plugins page.
add_action( \'plugin_action_links_\' . plugin_basename( __FILE__ ), array( $this, \'add_settings_link\' ) );
}
public function register_settings()
{
register_setting( \'acau_settings\', \'acau_settings\', array( $this, \'sanitize\' ) );
// ID / title / callback / page
add_settings_section( \'configuration_section\', __( \'Configuration\', \'my-plugin-slug\' ), array( $this, \'print_section_info\' ), $this->settings_page_name );
// ID / title / callback / page / section
add_settings_field( \'acau_setting_1\', __( \'Irrelevant setting with integer value\', \'my-plugin-slug\' ), array( $this, \'acau_setting_1_callback\' ), $this->settings_page_name, \'configuration_section\' );
add_settings_field( \'acau_setting_2\', __( \'Cart minimum quantity\', \'my-plugin-slug\' ), array( $this, \'acau_setting_2_callback\' ), $this->settings_page_name, \'configuration_section\' );
}
public function add_settings_page()
{
// This page will be under "Settings"
add_options_page(
\'Settings Admin\', $this->settings_menu_name, \'manage_options\', $this->settings_page_name, array( $this, \'create_settings_page\' )
);
}
/**
* Get the option that is saved or the default.
*
* @param string $index. The option we want to get.
*/
public function acau_get_settings( $index = false ) {
$defaults = [ \'acau_setting_1\' => 1000,\'acau_setting_2\' => true ];
$settings = get_option( \'acau_settings\', $defaults );
$settings = wp_parse_args( $settings, $defaults );
if ( $index && isset( $settings[ $index ] ) ) {
return $settings[ $index ];
}
return $settings;
}
public function create_settings_page()
{
$this->options = $this->acau_get_settings();
?>
<div class="wrap">
<h1>My Plugin Name</h1>
<form method="post" action="options.php">
<?php
// This prints out all hidden setting fields
settings_fields( \'acau_settings\' );
do_settings_sections( $this->settings_page_name );
submit_button();
?>
</form>
</div>
<?php
}
function add_settings_link( $links ) {
$links = array_merge( array(
\'<a href="\' . esc_url( admin_url( \'/options-general.php?page=\' . $this->settings_page_name ) ) . \'">\' . __( \'Settings\' ) . \'</a>\'
), $links );
return $links;
}
/**
* Sanitize each setting field as needed
*
* @param array $input Contains all settings fields as array keys
*/
public function sanitize( $input )
{
$new_input = array();
if( isset( $input[\'acau_setting_1\'] ) )
$new_input[\'acau_setting_1\'] = absint( $input[\'acau_setting_1\'] );
if( isset( $input[\'acau_setting_2\'] ) )
$new_input[\'acau_setting_2\'] = ( $input[\'acau_setting_2\'] == 1 ? 1 : 0 );
return $new_input;
}
/**
* Print the Section text
*/
public function print_section_info()
{
return;
// print \'Enter your settings below:\';
}
/**
* Get the settings option array and print one of its values
*/
public function acau_setting_1_callback()
{
printf(
\'<input type="text" id="acau_setting_1" name="acau_settings[acau_setting_1]" value="%1$s" />
<p class="description">%2$s</p>\',
isset( $this->options[\'acau_setting_1\'] ) ? esc_attr( $this->options[\'acau_setting_1\']) : \'\',
__( \'Irrelevant setting 1 description.\', \'my-plugin-slug\' )
);
}
public function acau_setting_2_callback() {
printf(
\'<fieldset>
<label><input id="acau_setting_2" type="checkbox" name="acau_settings[acau_setting_2]" value="1" %1$s />%2$s</label>
</fieldset>\',
isset( $this->options[\'acau_setting_2\'] ) && ( 1 == $this->options[\'acau_setting_2\'] ) ? \'checked="checked" \':\'\',
__( \'Change minimum product quantity on cart page from 0 to 1.\', \'my-plugin-slug\' )
);
}
}
if( is_admin() )
$my_settings_page = new my_plugin_name_settings();
// Only if WooCommerce is active.
if ( in_array( \'woocommerce/woocommerce.php\', apply_filters( \'active_plugins\', get_option( \'active_plugins\' ) ) ) || ( get_site_option(\'active_sitewide_plugins\') && array_key_exists( \'woocommerce/woocommerce.php\', get_site_option(\'active_sitewide_plugins\') ) ) ) {
// Run plugin.
add_action( \'template_redirect\', \'run_plugin\' );
function run_plugin() {
if (! is_cart() ) return; // Only if it\'s cart page.
// Enqueue CSS and js file. Localize to use php variables from plugin settings.
add_action( \'wp_enqueue_scripts\', \'my_plugin_name\' );
function my_plugin_name( ) {
$plugin_abbv_name = \'acau\';
$plugin_slug = \'my-plugin-slug-for-woocommerce\';
$plugin_short_slug = \'my-plugin-slug\';
wp_enqueue_style( $plugin_short_slug . \'-style\', plugins_url() . \'/\' . $plugin_slug . \'/css/\' . $plugin_slug . \'.css\');
wp_enqueue_script( $plugin_short_slug . \'-script\', plugins_url() . \'/\' . $plugin_slug . \'/js/\' . $plugin_slug . \'.js\', \'\', array(\'jquery\'));
$acau_settings_page = new my_plugin_name_settings();
// js variable name => variable value
$data = array (
\'acau_setting_1\' => $acau_settings_page->acau_get_settings(\'acau_setting_1\'),
);
wp_localize_script( $plugin_short_slug . \'-script\', \'phpVars\', $data );
// Cart page minimum qty = 1 instead of 0.
if (1 == $acau_settings_page->acau_get_settings(\'acau_setting_2\') ) {
add_filter( \'woocommerce_quantity_input_args\', \'custom_cart_min_qty\', 10, 2 );
function custom_cart_min_qty( $args, $product ) {
$args[\'min_value\'] = 1;
return $args;
}
}
}
}
}
?>
