How to improve the efficiency of PHP programming?

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How to improve PHP Programming efficiency ？

　　1.、 Replace double quotation marks with single quotation marks to contain the string , It will be faster . because PHP The variable will be collected in the string enclosed in double quotation marks , Single quotes do not , Attention ： as long as echo Can do this , It is a method that can treat multiple strings as parameters “ function ”

　　2、echo Than print fast , And the application echo Multiple parameters of ( Translation notes ： Use commas instead of periods ) Replace character concatenation , like echo$str1,$str2.

　　3、 In performance for Before reincarnation, the number of reincarnations must be , Don't calculate the value every cycle , application foreach replace .

　　4、include When filing, just apply the relative diameter , Because it prevents PHP Go to include_path The rate at which files are found in , Less time is required to analyze the control system path .

　　5、 If you want to know the script begins to perform ( Translation notes ： That is, the server receives a request from the client ) The moment of , application $_SERVER[‘REQUEST_TIME’] Better than the time().

　　6、 Suppose a string exchange function , Array or character can be accepted as parameter , And the parameter length is not long , Then be able to write a replacement code , Make every parameter passed a character , Instead of just writing one line of code to accept arrays as parameters for query and exchange .

　　7、 Define only a partial variable without using it in a function , It also slows down the rate ( The degree is equivalent to incrementing a partial variable ).PHP Maybe check if there are global variables .

　　8、 The use of methods seems to be related to the number of methods defined in the class , Because of me ( Before and after the test method ) Added 10 One way , But there is no change in function .

　　9、 Use an empty function with one argument , The time it consumes is equivalent to fulfilling 7 to 8 Partial variable increment manipulation of times . The time consumed in a similar way is close to 15 Partial variable increment manipulation of times .

　　10、Apache Dissect a PHP The time of a script is longer than analyzing a static HTML Page slow 2 to 10 times . Just use static HTML page , Rarely used script .

　　11、 Unless the script can cache , Otherwise, I will compile it again every time . Introduce a set PHP The caching mechanism can be promoted on weekdays 25% to 100% The function of , To avoid compiling expenses .

　　12、 Just cache , Applicable memcached.memcached It is a high-performance memory tool cache system , Can be used to speed up static Web Applications , Increase the load on the database . Pair operation code (OPcode) The cache is very effective , So that the script doesn't have to be recompiled for every request .