PHP Performance Efficiency optimization

1, in the case can be used file_get_contents alternative File,fopen,feof,fget series of methods, as far as possible to use the feil_get_contents, because it is much more efficient! But pay attention to the PHP version of file_get_contents when you open the URL file

2, as far as possible to file operations, although the PHP file operation efficiency is not low

3, optimize the Select SQL statement, as little as possible insert,update operation

4, use PHP intrinsics as much as possible (experience problem, don't waste time looking for PHP internal function,)

5, do not declare variables in the mixed, especially large variables,

6, multidimensional arrays try not to iterate over nested assignments

7, do not use regular expressions in cases where you can manipulate functions with PHP internal characters

8,foreach is more efficient, use foreach instead of while and for loops as much as possible

9, use single quotation mark instead of double quotation mark reference string

10, the use of i+=1 instead of i=i+1, in line with C + + habits, efficiency is relatively high

11, for the global variable, use up should unset () off

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