PHP large array loop problem_PHP tutorial
My little sister just switched to PHP. My boss asked me to optimize the execution efficiency of this code
The optimization I know now is outside the small loop, and it seems to be of no use here.
Dear heroes, how should I optimize ne? The leader said to put it in the memory or something.
Basically, it is two large arrays that continuously loop to calculate the weight.
<?php error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT); class weight { private $_aItems = array(); private $_aTable = array(); private $_aDict = array(); private $_aMatchs = array(); private $_aShow = array(); function __construct() { } public function newItems($aItems){ //添加新的检索内容 if (!is_array($aItems)) $aItems = (array)$aItems; $this->_aItems = $aItems; $this->_aMatchs = array(); $this->_aShow = array(); } public function newTable($aTable){ if (!is_array($aTable)) $aTable = (array)$aTable; $this->_aTable = $aTable; $this->generateDict(); } private function generateDict() { //将字典处理成数组形式 $convert = function($value) { $value = str_replace('|', ',', $value); $value = explode(',', $value); return $value; }; $this->_aDict = array_map($convert, $this->_aTable); } public function getMatchs() { //返回对照表 return $this->_aMatchs; } public function getShow($sRule = 'debug') { /*返回格式化的结果集 * $sFormat: 指定输出格式 */ if (empty($this->_aItems)||empty($this->_aTable)) //字典源文件不存在 return false; if (empty($this->_aShow)) { /*匹配表还没有生成,自动调用相应的命令生成*/ $this->loopTable(); } $makeDumpStr = function($value, $key) use (&$dumpStr) { //生成导出文件的文本 if (count($value) >1) { foreach ($value as $valueOne) { $valueStr .= $valueOne. ','; } $dumpStr .= $this->_aItems[$key] . "\t匹配多个记录号\t". $valueStr ."\r\n"; } else { $dumpStr .= $this->_aItems[$key] . "\t匹配惟一记录号\t". $value[0] ."\r\n"; } }; switch($sRule) { case 'debug': print_r($this->_aShow); break; case 'json': return json_encode($this->_aShow); break; case 'txt': $timeExport = date("Y/M/D h:i:s"); $dumpStr = ''; $rFile = fopen('dump.txt', 'w'); array_walk($this->_aShow, $makeDumpStr); $sContent = <<<EOT ========DUMP-FILE-{$timeExport}========================= {$dumpStr} EOT; fwrite($rFile, $sContent); fclose($rFile); break; default: return $this->_aShow; break; } } private function loopTable() { //遍历 foreach ($this->_aItems as $iItemKey=> $sItemLine) { $this->matchElement($iItemKey); //print_r($this->_aMatchs); $this->match2Show($iItemKey); //print_r($this->_aShow); //echo "-----------------"; } //print_r($this->_aMatchs); //print_r($this->_aShow); } private function matchElement($iKey) { $iMax = 0; foreach ($this->_aDict as $iDictKey => $aDictLine) { foreach($aDictLine as $sDictElement) { $str = $this->_aItems[$iKey]; if(strstr($str, $sDictElement)){ //匹配到一个元素,计数器+1 ++$this->_aMatchs[$iKey]['keyring'][$iDictKey]; } } if (!$this->_aMatchs[$iKey]['keyring'][$iDictKey]) { //没有匹配到内容 $this->_aMatchs[$iKey]['keyring'][$iDictKey] = 0; } if ($iMax< $this->_aMatchs[$iKey]['keyring'][$iDictKey]) $iMax = $this->_aMatchs[$iKey]['keyring'][$iDictKey]; $this->_aMatchs[$iKey]['index'] = array( 'key' => $iDictKey, 'count' => $iMax ); } } private function match2Show($iKey) { //将对照表转化为结果集 $multiMatch = array(); //echo "ikey =". $iKey.", "; foreach ($this->_aMatchs[$iKey]['keyring'] as $iMatchKey => $iVal) { if ($iVal< $this->_aMatchs[$iKey]['index']['count']) { //这个值比最大值小 //echo "x"; continue; } else { //这个值跟最大值相等,将结果累加到记录中 //echo "y"; $multiMatch[] = $iMatchKey; } } if (count($multiMatch)> 1) //多于一条记录匹配值相同 $this->_aShow[$iKey] = $multiMatch; else //匹配值最大值唯一 $this->_aShow[$iKey] = array($this->_aMatchs[$iKey]['index']['key']); } } $aItems = array( 'chinaisbig', 'whichisnot', ..... 上万条 ..... 'totalyrightforme', ); $aTable = array( 'china,is|small', 'china,big|me', ..... 上千条 ..... 'china,is|big,wich|not,me', ); $weight = new weight(); $weight->newItems($aItems); $weight->newTable($aTable); $weight->getShow('debug'); ?>

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
