man4toman

<?php
if(isset($_POST["submit"])){
	if(isset($_POST["url"]) && filter_var($_POST["url"], FILTER_VALIDATE_URL)){
		//Get extension id
		$pos = strrpos($_POST["url"], '/');
		$end = $pos === false ? $_POST["url"] : substr($_POST["url"], $pos + 1);
		$id = substr($end, 0, strpos($end, "?"));
		$durl = "https://clients2.google.com/service/update2/crx?response=redirect&x=id%3D".$id."%26uc&prodversion=32";
		//Simply get!
		header("Location: $durl");

man4toman

<?php
add_action( 'add_meta_boxes', array ( 'add_tinymce_to_excerpt', 'switch_boxes' ) );
class add_tinymce_to_excerpt{
    public static function switch_boxes(){
        if ( ! post_type_supports( $GLOBALS['post']->post_type, 'excerpt' ) ){
            return;
        }
        remove_meta_box( 'postexcerpt', '', 'normal' );
        add_meta_box( 'postexcerpt2', 'Excerpt' , array ( __CLASS__, 'show' ), null, 'normal', 'core' );
    }

man4toman

<?php
function wp_sanitize_array( $input ) {
  return array_map( function( $val ) {
    return sanitize_text_field( $val );
  }, $input );
}

man4toman

<?php
/*
* Method 1: use file_put_contents, but it disabled in many shared hosts
*/

$url = "http://site.ltd/test-image.jpg";
file_put_contents("/path/to/folder/" . basename($url), file_get_contents($url));


/*

man4toman

<?php
require_once(ABSPATH . 'wp-admin/includes/media.php');
require_once(ABSPATH . 'wp-admin/includes/file.php');
require_once(ABSPATH . 'wp-admin/includes/image.php');
if(!function_exists('wp_get_current_user')) {
	include(ABSPATH . "wp-includes/pluggable.php"); 
}

$url = "http://xyz.ltd/filenam.png";//Just a sample
$file = array();

man4toman

<?php
/*
* Method 1: use curl, it must return 200 for http return code
*/
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
if( $httpCode == 200 ){ echo "File exists"; }

man4toman

<?php
/**
 * More parameters:
 * @link http://codex.wordpress.org/Function_Reference/add_post_type_support
**/

add_post_type_support( 'page', 'excerpt' );

man4toman

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
// exit form direct access

global $product;
if ( empty( $product ) || ! $product->exists() ) {
	return;

man4toman

<?php namespace GM\WWWPostThumbnail;
/**
 * Plugin Name: WWW Post Thumbnail
 * Description: Allow to use an external image url as featured image.
 * Plugin URI: https://gist.github.com/Giuseppe-Mazzapica/928bc22e5f49a654cf7c
 * Author: Giuseppe Mazzapica
 * Author URI: https://github.com/Giuseppe-Mazzapica
 * License: MIT
 * Version: 0.1.0
 *

man4toman

<?php

/**
 * @link https://developer.wordpress.org/reference/functions/get_post_meta/
**/

// Only for post types
if( get_post_meta( $post_id, '_meta_key', true ) ) {
    // do something
}