PHP design Pattern Notes and summaries (3) SPL Standard library

Use of SPL libraries (PHP standard library)

1. Splstack,splqueue,splheap,splfixedarray and other data structure classes

① Stack (splstack) (Advanced post-out data structure)

index.php:

<?PHPDefine(' BASEDIR ', __dir__);//defining a root directory constantincludeBASEDIR. ' /common/loader.php '; Spl_autoload_register (' \\common\\loader::autoload ');$stack=NewSplstack ();$stack->push ("data1\n");//into the stack$stack->push ("data2\n");Echo $stack->pop ();//out of the stackEcho $stack->pop ();

Run, page output (view source file):

Data2data1

② Queue (Splqueue) (FIFO-first-out data structure)

index.php:

<?PHPDefine(' BASEDIR ', __dir__);//defining a root directory constantincludeBASEDIR. ' /common/loader.php '; Spl_autoload_register (' \\common\\loader::autoload ');$queue=Newsplqueue ();$queue->enqueue ("data1\n");//Queue$queue->enqueue ("data2\n");Echo $queue->dequeue ();//out TeamEcho $queue->dequeue ();

Run, page output (view source file):

Data1data2

③ Heap (SPLHEAP)

Minimum pair: Splminheap

index.php:

<?PHPDefine(' BASEDIR ', __dir__);//defining a root directory constantincludeBASEDIR. ' /common/loader.php '; Spl_autoload_register (' \\common\\loader::autoload ');$head=Newsplminheap ();$head->insert ("data1\n");//Deposit Heap$head->insert ("data2\n");Echo $head-Extract();//extracting data from a heapEcho $head-Extract();

Run, page output (source code):

Data1data2

④ fixed-size arrays (Splfixedarray)

index.php:

<? PHP Define // defining a root directory constant include BASEDIR. ' /common/loader.php '; Spl_autoload_register (' \\common\\loader::autoload '); $array New Splfixedarray (ten);  // a fixed-length array, such as a length of ten $array [0] = 123; $array [9] = 1234; Var_dump ($array);

Run, page output:

Object (Splfixedarray) [1]   123           null  NULL null- NULL NULLNULL null    1234  

2. Arrayiterator, Appenditerator, countable, arrayobject

3. Functions provided by SPL

PHP design Pattern Notes and summaries (3) SPL Standard library