PHP develops several tips for improving performance

1. Use commas to concatenate strings instead of periods

echo "AAA". " bbb

echo "AAA", "BBB";

2. Use double quotation marks when strings contain variables

3.require faster than require_once

4. Calculate the cycle length in advance

 
   
  
   
  
  
   5. Use the Foreache loop instead of the while live for loop (execution speed: Foreache
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   6. File access, using file_get_contents () to read the file. PHP has four ways to read data from files: Fread (), file_get_contents (), file (), and ReadFile (). Fread (), file_get_contents (), and ReadFile () return data as a string, and file () returns the data in the file as an array. Only file_get_contents () caches files in memory for faster read and write operations, which is known as memory mapping.
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