Backend DevelopmentPHP TutorialPHP function trim() that removes whitespace characters or other predefined characters on both sides of a stringPHP function trim() that removes whitespace characters or other predefined characters on both sides of a string
Example
Remove the characters on the left side of String ("He" in "Hello" and "d!" in "World"):
<?php $str = "Hello World!"; echo $str . "<br>"; echo trim($str,"Hed!"); ?>
Definition and Usage
trim() function removes whitespace characters or other predefined characters on both sides of a string.
Related functions:
ltrim() - Removes whitespace characters or other predefined characters on the left side of a string.
rtrim() - Removes whitespace characters or other predefined characters on the right side of the string.
Syntax
trim(string,charlist)
| Parameters | Description |
| string | Required. Specifies the string to check. |
| charlist | Optional. Specifies which characters are removed from the string. If this parameter is omitted, all the following characters are removed:
|
| PHP Version: | |
| ##Update Log | |
| In PHP 4.1, the charlist parameter was added. |
更多实例 实例 1 移除字符串两侧的空格： <?php $str = " Hello World! "; echo "Without trim: " . $str; echo "<br>"; echo "With trim: " . trim($str); ?> 上面代码的 HTML 输出如下（查看源代码）： <!DOCTYPE html> <html> <body> Without trim: Hello World! <br>With trim: Hello World! </body> </html> 上面代码的浏览器输出如下： Without trim: Hello World! With trim: Hello World! 实例 2 移除字符串两侧的换行符（\n）： <?php $str = "nnnHello World!nnn"; echo "Without trim: " . $str; echo "<br>"; echo "With trim: " . trim($str); ?> 上面代码的 HTML 输出如下（查看源代码）： <!DOCTYPE html> <html> <body> Without trim: Hello World! <br>With trim: Hello World! </body> </html> 上面代码的浏览器输出如下： Without trim: Hello World! With trim: Hello World! 例子 <?php $str = "##使用函数trim去掉字符串两端特定字符####"; $str1 = trim($str,"#"); //为函数trim传入第二个参数， trim将删除字符串$str两端的#字符 echo $str."<br>"; echo $str1; ?> 输出： ##使用PHP函数trim()去掉字符串两端特定字符#### 使用函数trim去掉字符串两端特定字符 |
The above is the detailed content of PHP function trim() that removes whitespace characters or other predefined characters on both sides of a string. For more information, please follow other related articles on the PHP Chinese website!
The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AMWhat’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.
PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AMPHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.
PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AMPHP 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 and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AMPHP 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.
Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AMPHP 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 and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AMPHP 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.
PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AMPHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AMPHP 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.
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
SublimeText3 Linux new version
SublimeText3 Linux latest version
Dreamweaver Mac version
Visual web development tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
SublimeText3 Mac version
God-level code editing software (SublimeText3)
