PHP performance optimization_PHP tutorial

Although the PHP language is powerful, it also requires programmers to write specifications to create code programs with superior performance. Below we will share with you tips on PHP performance optimization.

"Use i+=1 instead of i=i+1. It conforms to the habits of c/c++ and is more efficient";

For global variables, you should unset() them after use

Perform as few file operations as possible, although PHP’s file operations are not inefficient;

Optimize the Select SQL statement and perform as few Insert and Update operations as possible (on update) , I was criticized) to achieve the purpose of optimizing PHP performance;

Use PHP internal functions as much as possible (but I wasted the time to find a function that does not exist in PHP and could have written a custom function The time of the function is a matter of experience!);

When file_get_contents can be used to replace file, fopen, feof, fgets and other series of methods, try to use file_get_contents because it is much more efficient! But be careful File_get_contents PHP version problem when opening a URL file;

Do not declare variables inside the loop, especially large variables: objects (this seems to be not just a problem in PHP?);

Try not to nest nested assignments in loops for multi-dimensional arrays;

Do not use regular expressions when you can use PHP’s internal string manipulation functions;

foreach is more efficient, try to use foreach instead while and for loops; (www.bkjia.com)

Use single quotes instead of double quotes to quote strings to achieve PHP performance optimization;

In multiple nested loops, if possible, The longest loop should be placed in the inner layer, and the shortest loop should be placed in the outer layer. This can reduce the number of times the CPU crosses the loop layer, thereby optimizing program performance

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