PHPSPL standard library-SplFixedArray instance _ PHP Tutorial

Use the SplFixedArray instance of the PHPSPL standard library. The PHPSPL standard library SplFixedArray uses instances this article mainly introduces the PHPSPL standard library SplFixedArray use instances. SplFixedArray is mainly used to process array-related functions, it is a sample of SplFixedArray in the solid php spl standard library.

This article mainly introduces the use of SplFixedArray in the php spl standard library. SplFixedArray is mainly used to process array-related functions. it is fixed-length and faster than normal array processing, for more information, see

SplFixedArray is mainly used to process array-related functions. Unlike common php arrays, SplFixedArray is an array with fixed length and key names, the advantage is faster processing than normal arrays.

Check my local Benchmark test:

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Ini_set ('memory _ limit ', '12800m '); For ($ size = 10000; $ size <10000000; $ size * = 4 ){ Echo PHP_EOL. "Testing size: $ size". PHP_EOL; For ($ s = microtime (true), $ container = Array (), $ I = 0; $ I <$ size; $ I ++) $ container [$ I] = NULL; Echo "Array ():". (microtime (true)-$ s). PHP_EOL; For ($ s = microtime (true), $ container = new SplFixedArray ($ size), $ I = 0; $ I <$ size; $ I ++) $ container [$ I] = NULL; Echo "SplArray ():". (microtime (true)-$ s). PHP_EOL; }

The result is as follows:

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Testing size: 10000 Array (): 0.004000186920166 SplArray (): 0.0019998550415039 Testing size: 40000 Array (): 0.017001152038574 SplArray (): 0.0090007781982422 Testing size: 160000 Array (): 0.050002098083496 SplArray (): 0.046003103256226 Testing size: 640000 Array (): 0.19701099395752 SplArray (): 0.16700983047485 Testing size: 2560000 Array (): 0.75704312324524 SplArray (): 0.67303895950317

In general, SplFixedArray is 20% ~ faster than php array ~ 30%, so if you are dealing with a large number of fixed-length arrays, it is strongly recommended to use.

The summary of the SplFixedArray class is as follows:

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SplFixedArray implements Iterator, ArrayAccess, Countable { /* Method */ Public _ construct ([int $ size = 0]) Public int count (void) Public mixed current (void) Public static SplFixedArray fromArray (array $ array [, bool $ save_indexes = true]) Public int getSize (void) Public int key (void) Public void next (void) Public bool offsetExists (int $ index) Public mixed offsetGet (int $ index) Public void offsetSet (int $ index, mixed $ newval) Public void offsetUnset (int $ index) Public void rewind (void) Public int setSize (int $ size) Public array toArray (void) Public bool valid (void) Public void _ wakeup (void) }

Use SplFixedArray:

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$ Arr = new SplFixedArray (4 ); $ Arr [0] = 'php '; $ Arr [1] = 1; $ Arr [3] = 'Python '; // Traversal, $ arr [2] is null Foreach ($ arr as $ v ){ Echo $ v. PHP_EOL; } // Obtain the array length Echo $ arr-> getSize (); // 4 // Increase the array length $ Arr-> setSize (5 ); $ Arr [4] = 'new one '; // Capture exceptions Try { Echo $ arr [10]; } Catch (RuntimeException $ e ){ Echo $ e-> getMessage (); }

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