Use of PHPSPL

Php spl can be seen in many frameworks and MVC. php spl accounts for a large proportion in many practical applications.

Two-Way linked list

 Push (1); $ obj-> push (2); $ obj-> push (3); $ obj-> unshift (10 ); // unshifit occupies the last element at the Bottom and adds the new node to the Bottom of the linked list (Bottom) $ obj-> rewind (); // you must call rewind to use current, point the node pointer to the bottom node $ obj-> next (); // next points to the next node $ obj-> prev (); // The pointer points to the previous node echo $ obj-> current (); // The pointer points to the current node if ($ obj-> current () {echo "y ";} else {echo "n";} if ($ obj-> valid () {// returns true if the current node is a valid node valid} $ obj-> pop (); // delete the current node pointed to by the pointer // var_dump ($ obj); print_r ($ obj );

Stack usage

 Push ("a"); // add data to the stack $ stack-> push ("B"); $ stack-> push ("c "); /* $ stack-> offsetSet (0, 'C'); // stack node 0 is the top node. set the value of the node $ stack-> rewind (); // The rewind of the two-way linked list is opposite to the rewind of the stack. the rewind of the stack points the current pointer to the TOP position. after the two-way linked list is called, it points to the position of the bottom echo "qq ". $ stack-> next (); // The next of the stack is opposite to the two-way linked list echo "re ". $ stack-> current ()."
"; // Echo" bo ". $ stack-> bottom ()."
"; // Echo" top ". $ stack-> top (); print_r ($ stack); * // traverse $ stack from TOP-> rewind (); while ($ stack-> valid ()) {echo $ stack-> key (). "=> ". $ stack-> current ()."
"; $ Stack-> next () ;}$ pop = $ stack-> pop (); echo $ pop; // The pop operation extracts the last element (TOP position) from the stack and deletes the node from the stack.

Queue

$ Que = new SplQueue (); $ que-> enqueue ("a"); // incoming queue $ que-> enqueue ("B "); $ que-> enqueue ("c"); // print_r ($ que); echo "bottom ". $ que-> bottom ()."
"; Echo" top ". $ que-> top (); $ que-> rewind (); $ que-> dequeue (); // remove print_r ($ que) from the bottom location );

ArrayIterator

 "Apple value", "orange" => "orange value", "grape" => "grape value "); // define a fruit array $ obj = new ArrayObject ($ fruits); $ it = $ obj-> getIterator (); // use foreach to traverse the array foreach ($ it as $ key => $ value) {echo $ key. "-> ". $ value."
";}$ It-> rewind (); // you must rewind it. // use while to traverse the array while ($ it-> valid ()) {echo $ it-> key (). "-> ". $ it-> current ()."
"; $ It-> next () ;}// skip some elements to print $ it-> rewind (); if ($ it-> valid ()) {$ it-> seek (1); // find the 1 element while ($ it-> valid () {echo $ it-> key (). "-> ". $ it-> current ()."
"; $ It-> next () ;}} echo"
"; $ It-> rewind (); // $ it-> ksort (); // key for sorting, // $ it-> rewind (); $ it-> asort (); // Sort by value while ($ it-> valid () {echo $ it-> key (). "-> ". $ it-> current ()."
"; $ It-> next ();}

AppendIterator

 Append ($ array_a); // append ArrayIterator to Iterator $ it-> append ($ array_ B); foreach ($ it as $ key => $ value) {echo $ key. "| ". $ value."
";}// Use the APPEND method to add the iterator object to the AppendIterator object. // add the values of the two arrays to an Interator.

MultipleIterator combines arrays into the entire output

$idIter = new ArrayIterator(array('01','02','03'));$nameIter =  new ArrayIterator(array('qq','ss','show'));$mit = new MultipleIterator(MultipleIterator::MIT_KEYS_ASSOC);$mit->attachIterator($idIter,"id");$mit->attachIterator($nameIter,"name");foreach($mit as $value){    print_r($value);}

File to print the name of the current folder.

date_default_timezone_get('PRC');$it = new FilesystemIterator('.');foreach($it as $value){    echo date("Y-m-d H:i:s",$value->getMtime())."
";    $value->isDir()?"
 
  ":"";    number_format($value->getSize());    echo $value->getFileName();}
 

IteratorIterator

$ Array = array ('value1 ', 'value2', 'value3', 'value4 ', 'value5'); $ out = new Outer (new ArrayIterator ($ array )); foreach ($ out as $ key => $ value) {echo $ key. "| ". $ value."
";} Class Outer extends IteratorIterator {public function current () {return parent: current (). "why";} public function key () {return parent: current (). "not" ;}}// you can customize the key and value values.

Print the object value

class Count implements Countable{    protected  $mycount = 4;    public function count(){        return $this->mycount;    }}$count  = new Count();echo count($count);

Autoload mechanism

Spl_autoload_extensions ('. class. php ,. php '); // specifies the extension ending with set_include_path (get_include_path (). PATH_SEPARATOR. "autoload/"); // Set the file directory spl_autoload_register (); new test (); // spl_autoload_register ('') you can customize // for example, I have a file under the folder autoload class test {public function _ construct () {echo "this is test. class. php ";}}

SPLFILE // file operations

date_default_timezone_set('PRC');$file = new SplFileInfo('qq.txt');echo "file is create at".date("Y-m-d H:i:s",$file->getCTime())."
";echo "file is modified at".date("Y-m-d H:i:s",$file->getMTime())."
";echo "file size".$file->getSize()."kb
";$fileObj = $file->openFile("r");while($fileObj->valid()){    echo $fileObj->fgets();}$fileObj = null;$file = null;