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There are three common methods for PHP comment code: 1. Use // or # to block one line of code, and it is recommended to use //; 2. Use /.../ to wrap code blocks with multiple lines, which cannot be nested but can be crossed; 3. Combination skills comments such as using /if(){}/ to control logic blocks, or to improve efficiency with editor shortcut keys, you should pay attention to closing symbols and avoid nesting when using them.
Sometimes when debugging or modifying PHP code, we do not want to delete certain codes directly, but instead want to temporarily "block" their execution. At this time, you need to use comment methods to "comment out" these codes.
PHP provides several commonly used annotation methods that can be used to temporarily disable single-line or whole-segment code. Below are some practical practices and precautions.
Single line comment: Quickly block one line of code
If you just want to temporarily close a line of code, you can use a single line comment symbol:
-
//—— Comment the content of the current line from the beginning to the end -
#——The effect is the same as//, but not often used
Example:
// echo "This code will not be executed"; # echo "This line will not be executed either"; echo "Only this sentence will output";
suggestion:
- This method is suitable for temporarily blocking one or two lines of code.
- Use
//is more common and easier to identify.
Multi-line comments: batch comments a piece of code
If you want to comment out multiple lines of code, you can wrap the entire code block in the form of /* ... */ :
/* echo "The first line is commented"; echo "The second line is also commented"; */ echo "Only this sentence takes effect";
Notice:
- This method cannot be used in nesting, otherwise it will lead to syntax errors.
- Can span multiple lines, suitable for temporary disabling of large segments of code.
Comment tips: Combination use improves efficiency
Sometimes you will see developers combining annotation techniques to do some flexible controls, such as:
/*
if ($condition) {
do_something();
}
*/This allows you to quickly switch whether the entire logic block is enabled.
Tips:
- During the development process, first use
//to comment a single line, and then use/* */to wrap multiple lines to avoid duplicate deletion and modification. - If the editor supports shortcut keys (such as Ctrl /), you can comment and select lines with one click to improve efficiency.
In general, commenting out the code in PHP is not complicated. The key is to choose the appropriate annotation method according to the scene. Just be careful not to miss closed symbols and avoid nested annotations to debug and test code safely. Basically that's it.
The above is the detailed content of Commenting Out Code in PHP. For more information, please follow other related articles on the PHP Chinese website!
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