what concatenation in php

There are 2 ways to declare a string in PHP, one in single quotes and the other in double quotes. 2 The biggest difference is that when a string contains a variable, the single quotation mark cannot output the value of the variable, but instead

Introduction to the concatenation of PHP ternary operators. For more information, see. Let's first look at a three-element formula: Copy codeThe code is as follows: $ A = 1; $ B = 2; $ c = 3; $ d = 4; Echo $ a ?> Generally, according to the

PHP operating mechanism and principle (underlying), and php operating mechanism. The PHP operating mechanism and principle (underlying). when talking about the php operating mechanism, we should first introduce the php module. php has three modules

The question of json concatenation in php is to splice the content in the database into json in the following format. please use the code to describe it. ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun','Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] And in

php Execution Principle PHP is a very simple application, the development of a very high efficiency of a language, its weak type of variable can save the programmer a lot of time and effort to define variables, type conversion and so on. It is a

PHP is simple, but it is not easy to be proficient. In addition to using it, we also need to know its underlying working principles. PHP is simple, but it is not easy to be proficient. In addition to using it, we also need to know its underlying

Ask for string concatenation. what I want to achieve is to press this button. if Cat_ID;?> Assume that the value of this ID is 6. Open http: // localhost/myweb/wp-admin/post-new.php? Cat = 6 I wrote this: Onclick = "window. location. href = './

The underlying operating mechanism and principle of PHP, and the underlying operating mechanism of php PHP is simple, but it is not easy to be proficient. In addition to using it, we also need to know its underlying Working principles. PHP is a

PHP is simple, but it is not easy to be proficient. In addition to using it, we also need to know its underlying Working principles. PHP is a dynamic language suitable for web development. Specifically, it is a software framework that uses C

This article we mainly share with you the PHP bottom operating mechanism of the detailed, first we will share with you PHP design concept and features, PHP four layer system, etc., hope to help everyone. 1. PHP Design concept and Features