Memory and time consumed by php Test Code Execution

To test the memory and time consumed by code execution in php, we can directly use the two functions, microtime and memory_get_usage. I will introduce them to you.

Let's take a look at the usage of the microtime and memory_get_usage functions.

Meaning and usage

Microtime ()The function returns the current Unix Timestamp and the number of microseconds.

Syntax

Microtime (get_as_float) parameter description
If the get_as_float parameter is given and its value is equivalent to TRUE, this function returns a floating point number.

Example

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<? Php Echo (microtime ()); ?>

Output:

0.25139300 1138197510

I. function prototype

Int memory_get_usage ([bool $ real_usage = false])

2. Version compatibility

PHP 4> = 4.3.2, PHP 5

III. Basic usage and Examples

1. Get the current memory consumption

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<? Php Echo memory_get_usage (); $ Var = str_repeat (www. bKjia. c0m, 10000 ); Echo memory_get_usage (); Unset ($ var ); Echo memory_get_usage (); ?>

Result: 62328 122504 62416

Note: The value output by the memory_get_usage () function is bytes.

2. The result of formatting memory_get_usage () is output in KB.

 

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<? Php Function convert ($ size ){ $ Unit = array ('B', 'kb', 'mb', 'gb', 'tb', 'petab '); Return @ round ($ size/pow (1024, ($ I = floor (log ($ size, 1024), 2 ). ''. $ unit [$ I]; } Echo convert (memory_get_usage (true )); ?>

265KB

Now we have finished introducing the two functions. Let's take a look at a test instance.

 

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<? Php $ T1 = microtime (true ); $ M1 = memory_get_usage (true ); Echo fixByte ($ m1). '<br/> '; /* When there are too many threads, there are too many threads, too many threads */ /* When there are too many threads, there are too many threads, too many threads */ $ T2 = microtime (true ); $ M2 = memory_get_usage (true ); Echo '<br/>'. fixByte ($ m2). '<br/> '; Echo 'Echo 'time'. round ($ t2-$ t1), 4). '<br/> '; Echo 'mem '. fixByte ($ m2-$ m1).' <br/> '; /** * Format the byte as a proper value. * @ Param int $ byte bytes * @ Param string $ string the number of readable bytes formatted */ Function fixByte ($ byte, $ string = true, $ dot_num = 9 ){ $ Ret = array ( 'Data' => $ byte, 'Danwei' => 'byte ', ); If ($ byte <1024 ){ } Else if ($ byte <1024*1024 ){ $ Ret ['data'] = round ($ byte/1024, $ dot_num ); $ Ret ['danwei'] = 'K '; } Else if ($ byte <1024*1024*1024 ){ $ Ret ['data'] = round ($ byte/(1024*1024), $ dot_num ); $ Ret ['danwei'] = 'M '; } Else if ($ byte <1024*1024*1024*1024 ){ $ Ret ['data'] = round ($ byte/(1024*1024*1024), $ dot_num ); $ Ret ['danwei'] = 'gb '; } Else if ($ byte <1024*1024*1024*1024*1024 ){ $ Ret ['data'] = round ($ byte/(1024*1024*1024*1024), $ dot_num ); $ Ret ['danwei'] = 'tb '; } If ($ string ){ $ Ret = $ ret ['data']. ''. $ ret ['danwei']; } Return $ ret; }