PHP writing format, php writing
Start with an example.
Launch the editor, create a php file and type the following code:
<?php echo "你好!"; ?>
Run
Name the file test.php and store it in the E:html directory.
Access the php file in the browser address bar: http://127.0.0.1/test.php, the output result is as follows:
<code class="language-php hljs">你好!</code>
In this example, we use the echo command to output a string "Hello!".
As can be seen from this example:
- The PHP file or PHP code segment starts with "", with the php code in the middle
- Each instruction set ends with ; symbol
- What the browser gets is the result after the PHP parser has executed the php code. Website viewers cannot view the original code of the php file
Of course, to output standard html code, you can improve the above example to:
PHP 测试 <?php echo "你好!"; ?>
It can be seen that PHP code can be mixed with XHTML code.
echo is a built-in instruction in PHP, used to output one or more strings. Similar to echo, there is print.
Below we will introduce the output function of php.
PHP echo and print statements
The difference between echo and print:
- echo - can output one or more strings
- print - only allows to output a string, the return value is always 1
Tip: echo outputs faster than print, echo has no return value, and print has a return value of 1.
PHP echo statement
echo is a language structure, which can be used without parentheses or with parentheses: echo or echo().
1. Display string
The following example demonstrates how to use the echo command to output a string (the string can contain HTML tags):
<?php echo "<h2 id="PHP-is-fun">PHP is fun!</h2>"; echo "Hello world!<br>"; echo "I'm about to learn PHP!<br>"; echo "This", " string", " was", " made", " with multiple parameters."; ?>
Run
2. Display variables
The following example demonstrates how to use the echo command to output variables and strings.
<?php $txt1="Learn PHP"; $txt2="manongjc.com"; $cars=array("Volvo","BMW","Toyota"); echo $txt1; echo "<br>"; echo "Study PHP at $txt2"; echo "My car is a {$cars[0]}"; ?>
Run
PHP print statement
Print is also a language structure that can use parentheses or not: print or print().
1. Display string
The following example demonstrates how to use the print command to output a string (the string can contain HTML tags):
<?php print "<h2 id="PHP-is-fun">PHP is fun!</h2>"; print "Hello world!<br>"; print "I'm about to learn PHP!"; ?>
Run
2. Display variables
The following example demonstrates how to use the print command to output variables and strings:
<?php $txt1="Learn PHP"; $txt2="manongjc.com"; $cars=array("Volvo","BMW","Toyota"); print $txt1; print "<br>"; print "Study PHP at $txt2"; print "My car is a {$cars[0]}"; ?>
Run
Original address: http://www.manongjc.com/php/php_format.html
Related reading:
php uses the filter_var() function to detect whether the url contains the query string
php detects whether it is an IPv6 address
php uses the filter_var() function to detect whether a number is within a range
How does php ajax determine that the network connection is disconnected

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

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

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

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.

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.