Three commonly used functions in the PHP SPL standard library

墨辰丷
Release: 2023-03-31 12:30:01
Original
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This article mainly introduces the commonly used functions in the PHP SPL standard library. This article focuses on the three functions of spl_autoload_extensions(), spl_autoload_register(), and spl_autoload(). Friends in need can refer to it

The PHP SPL standard library provides some functions for processing such as automatic loading, iterator processing, etc.

spl_autoload_extensions() adds file extensions that can be loaded by spl_autoload()
spl_autoload_register() registers the function into the SPL __autoload function stack.

The code is as follows:

/*test1.php*/ 
        
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The code is as follows:

/*test1.php*/ 
        
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The code is as follows:

/*test1.php*/ getFilename(); //test2.lib.php
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Other SPL function introduction:
class_implements — Returns the specified class All interfaces implemented.
class_parents — Returns the parents of the specified class.
class_uses — Return the traits used by the given class
iterator_apply — Call a user-defined function for each element in the iterator
iterator_count — Count the number of elements in the iterator
iterator_to_array — Will The elements in the iterator are copied to the array
spl_autoload_functions — Returns all registered __autoload() functions
spl_autoload_unregister — Unregisters registered __autoload() functions
spl_classes — Returns all available SPL classes
spl_object_hash — Returns the hash id of the specified object

If iterator related functions are used:

The code is as follows:

$iterator = new ArrayIterator (array( 'recipe' => 'pancakes' , 'egg' , 'milk' , 'flour' )); print_r(iterator_to_array($iterator)); //将迭代器元素转化为数组 echo iterator_count($iterator); //计算迭代器元素的个数 print_r(iterator_apply($iterator, 'print_item', array($iterator)));//为迭代器每个元素调用自定义函数 function print_item(Iterator $iterator) { echo strtoupper ( $iterator -> current ()) . "\n" ; return TRUE ; }
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