PHP

First, __autoloadThis is an auto-load function, which is triggered when we instantiate an undefined class in PHP5. Look at the following example:printit.class.php //File index.php //File doprint ();? >Second, Spl_autoload_register ()1. It

function Myhash ($STR) {hash (i) = hash (i-1) * + str[i]$hash = 0;$s = MD5 ($STR);$seed = 5;$len = 32;for ($i = 0; $i (hash $hash = sprintf ("%u", $hash *) + ord ($s {$i});$hash = ($hash * + ord ($s {$i}) & 0x7FFFFFFF;$hash = ($hash }return $hash & 0

Public Function Demo ($arr){ $len = count ($arr); if ($len = = 1) { return $arr; } else { for ($i = 1; $i for ($k = 0; $k if ($arr [$k] > $arr [$k + 1]) { $temp = $arr [$k];

function quicksort (Array $arr = Array ()){ $len = count ($arr); if ($len > 1) { $key = $arr [0]; $l _arr = Array (); $r _arr = Array (); for ($i = 1; $i if ($arr [$i] $l _arr[] = $arr

The intersection of two arrays can be implemented using Array_intersect (), Array_inersect_assoc,array_intersect_key, where the Array_intersect () function is the intersection of two numbers, Returns an array of common elements for the intersection (

Two methods and differences of PHP array mergingIf it is an associative array, the following:Copy CodeThe code is as follows:$a = Array (' WHERE ' = ' uid=1 ',' Order ' = ' uid ',);$b = Array (' WHERE ' = ' uid=2 ',' Order ' = ' uid desc ',);1.

In fact, broadly speaking, PHP is a C language application on the Web Template, php smarty template used more, like JSP is a Java servlet template (oh, yes, JSP has a jstl tag), complex template syntax is difficult to be welcomed by developers.In

Differences between Ajax and JavaScript: ajaxjavascript Javascript is a scripting language executed on the browser. Ajax is a development technology for creating interactive web applications. It uses a series of related technologies, including

PHPExcel description and phpqrcode parameter description The following are the usage methodsInclude 'phpexcel. php ';Include 'phpexcel/Writer/excel2007.php ';// Or include 'phpexcel/Writer/excel5.php'; for output. xlsCreate an excel file$

Sprintf function php detailed usage method, sprintf function php  PHP sprintf () function Let me explain why I want to write the preface to this function. This is a token verification document I developed in the second step, that is, a function that

Php determines whether a json object exists, and php judges a json object In the actual test, when php reads a json array, if or array_key_exists is used to determine whether an object exists, an error is returned. The following is a correct method

Determine whether the user has followed the php code parsing and the Public php In today's activities, many users are guided to pay attention to the public accounts before they can participate in the activities. How can we determine whether users

Php automatic loading usage instance analysis, php loading instance analysis This example describes the usage of php automatic loading class. We will share this with you for your reference. The details are as follows: Understanding ideas is the

Fast sorting algorithm analysis and project development algorithm analysis used in php Project Development This example describes the fast Sorting Algorithm Used in php project development. We will share this with you for your reference. The details

The mysteries of regular expressions and the mysteries of Regular Expressions 1. Introduction to Regular Expressions (1) What is a regular expression: it is a formula that uses a certain pattern to match a type of string. It is mainly used for

Explore PHP multi-process and PHP processPreparation We all know that PHP is executed by a single process. PHP mainly depends on the multi-process of the server or PHP-FPM and the reuse of their processes, but PHP also has great significance in

Why ajax? Ajax applications have the following advantages:1. Improved user experience through asynchronous mode2. optimized the transmission between the browser and the server, reduced unnecessary data round-trips, and reduced bandwidth usage3. the

PHP file and folder operations (create, delete, move, copy ), Create a FileUtil. php file. The content and calling method are as follows: Another call method: $fu = new FileUtil();$fu->copyFile('a/1/2/3', 'a/1/2/4');  We recommend a 360-disk search

Php does not have data (empty) when reading json. When PHP is used to call some json interface files, if file_get_contents is used to obtain the page json data After json_decode () is used for parsing, data cannot be normally output. The returned

Php development-generate two-dimensional codes with parameters in batches. php batch Parameters The two-dimensional code with parameters is very useful for channel marketing and promotion. Multiple two-dimensional codes with different scenario