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What this article brings to you is about high-efficiency programming: PHP optimization guidelines, which have certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
Use less regular expressions
##str_replace Function is better than
preg_replace Much faster,
strtr function is faster than
str_replace .
strpbrk()、strncasecmp()、strpos()、strrpos()、stripos()、strripos()。
Character replacement
In addition, do not make unnecessary substitutions. Even if there is no substitution, str_replace will allocate memory for its parameters. very slow!
Use strpos to search first (very fast) to see if it needs to be replaced, and if so, replace it.
If replacement is needed, the efficiency is almost the same, and the difference is about 0.1%.
If no replacement is needed: use strpos 200% faster.
is better than time()
. One is ready-made and can be used directly, and the other requires the result obtained by the function.
$iIncrement
$i will be slower than
$i.
This difference is specific to PHP and does not apply to other languages, so please don't modify your C or Java code and expect it to be instantly faster, it won't work.
$i
is faster because it only requires 3 instructions (opcodes), while$i requires 4 instructions.
Use gzcompress() and gzuncompress() to compress large-capacity strings Compress and decompress, and then
This built-in function uses the gzip algorithm and can compress strings 90%
.You can use file_get_contents() instead
fopen(),
feof(),
fgets() and other series of methods, try to use
file_get_contents().
echo string uses
Although, echo
is a language structure, not a real function.However, it can pass multiple strings separated by commas as "function" parameters, so it will be faster.
This can avoid that if spaces or newlines are accidentally added after the PHP end tag, PHP will start to output these spaces, and there is no intention to output them in the script at this time.
and magic quotes
in
require Try to use absolute paths.
If a relative path is included, PHP will traverse to find the file in
include_path
Try not to use require_once
and include_once
to include files. They have an additional process of determining whether the file is referenced. Try not to use it if possible.
Use the require
and include
methods instead.
Functions are faster than class methods
#Calling a function with only one parameter and an empty function body costs Time is equal to 7-8
times $localvar
operations.
The class method with the same function requires about 15 $localvar
operations.
Use subclass methods
#Only put reusable methods in the base class, try to put other functions in the subclass Implemented in a class, the performance of the method in the subclass is better than that in the base class.
Pass parameters by reference
#Realize multiple return values of the function through parameter address reference, which is better than passing parameters by reference Value transfer is efficient. The method is to add &
before the parameter variable.
Make it as static as possible
If a method can be static, declare it as static, the speed can be Improved 1/4
, even when I tested, this improved nearly three times.
The main difference in efficiency between static and non-static methods is memory. Static methods generate memory when the program starts, and instance methods (non-static methods) generate memory while the program is running.
So, static methods can be called directly, while instance methods must first create an instance and then call them. Static methods are very fast, but too many methods will occupy memory.
Any language operates on memory and disk. As for whether it is object-oriented, it is just a question of the software layer. The bottom layer is the same, but the implementation method is different.
Static memory is continuous because it is generated at the beginning of the program, while instance methods apply for discrete space, so of course it is not as fast as static methods.
Static methods always call the same memory. The disadvantage is that they cannot be automatically destroyed, but instantiation can be destroyed.
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