概述
PHP有着众多的内置函数,其中大多数函数都被开发者广发使用。但也有一些同样有用却被遗忘在角落,本文将介绍7个鲜为人知功能却非常酷的函数。
highlight_string()
当需要在网页中展示PHP代码时,highlight_string()函数就显得非常有用。该函数通过PHP内置定义的颜色,返回函数中代码的高亮显示版本。
代码如下:
highlight_string('');
echo highlight_string('',true);
?>
str_word_count()
这个函数可以方便的将输入的字符串参数中的单词个数返回。
代码如下:
$str = "hello world";
echo str_word_count($str); //输出 2
?>
levenshtein()
该函数可以方便的返回两个参数之间的levenshtein(编辑距离)。曾经遇到过一个需求,用户在编辑身份证的时候,限制用户只能修改4位数字,使用的就是这个函数。
代码如下:
$idcard='230406198506206797';
$newIdcard='230406198506207798';
echo levenshtein($idcard,$newIdcard); //输出 2
?>
get_defined_vars()
这个函数在调试程序的时候非常有用,它会返回包含所有已定义变量的数组,其中包含环境、系统以及用户自定义变量。
代码如下:
var_dump(get_defined_vars());
?>
escapeshellcmd()
该函数用来跳过字符串中的特殊符号,防止恶意用户耍花招破解服务器系统。可以搭配exec()与system()函数使用。
代码如下:
$command = './configure '.$_POST['configure_options'];
$escaped_command = escapeshellcmd($command);
system($escaped_command);
?>
checkdate()
该函数可以用来检测日期参数的有效性。它可以验证输入的每一个参数的合法性。
代码如下:
var_dump(checkdate(12, 31, 2000));
var_dump(checkdate(2, 29, 2001));
//输出
//bool(true)
//bool(false)
?>
php_strip_whitespace()
该函数会返回删除了注释与空格后的PHP源码。这对实际代码数量和注释数量的对比很有用。
代码如下:
// 注释1
/*
* 注释2
*/
echo php_strip_whitespace(__FILE__);
do_nothing();
?>

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Dreamweaver Mac version
Visual web development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

WebStorm Mac version
Useful JavaScript development tools