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          add a note add a note

          User Contributed Notes 5 notes

          up
          164
          Anonymous
          8 years ago
          The keyword 'use' has two different applications, but the reserved word table links to here.

          It can apply to namespace constucts:

          file1:
          <?php namespace foo;
            class
          Cat {
              static function
          says() {echo 'meoow';}  } ?>

          file2:
          <?php namespace bar;
            class
          Dog {
              static function
          says() {echo 'ruff';}  } ?>

          file3:
          <?php namespace animate;
            class
          Animal {
              static function
          breathes() {echo 'air';}  } ?>

          file4:
          <?php namespace fub;
            include
          'file1.php';
            include
          'file2.php';
            include
          'file3.php';
            use
          foo as feline;
            use
          bar as canine;
            use
          animate;
            echo \
          feline\Cat::says(), "<br />\n";
            echo \
          canine\Dog::says(), "<br />\n";
            echo \
          animate\Animal::breathes(), "<br />\n"?>

          Note that
          felineCat::says()
          should be
          \feline\Cat::says()
          (and similar for the others)
          but this comment form deletes the backslash (why???)

          The 'use' keyword also applies to closure constructs:

          <?php function getTotal($products_costs, $tax)
              {
                 
          $total = 0.00;
                 
                 
          $callback =
                      function (
          $pricePerItem) use ($tax, &$total)
                      {
                         
                         
          $total += $pricePerItem * ($tax + 1.0);
                      };
                 
                 
          array_walk($products_costs, $callback);
                  return
          round($total, 2);
              }
          ?>
          up
          20
          Anonymous
          3 years ago
          Tested on PHP 7.0.5, Windows
          The line "use animate;" equals the line "use animate as animate;"
          but the "use other\animate;" equals "use other\animate as animate;"

          file1:
          <?php namespace foo;
            class
          Cat {
              static function
          says() {echo 'meoow';}  } ?>

          file2:
          <?php namespace bar;
            class
          Dog {
              static function
          says() {echo 'ruff';}  } ?>

          file3:
          <?php namespace other\animate;
            class
          Animal {
              static function
          breathes() {echo 'air';}  } ?>

          file4:
          <?php namespace fub;
            include
          'file1.php';
            include
          'file2.php';
            include
          'file3.php';
            use
          foo as feline;
            use
          bar as canine;
            use
          other\animate;       //use other\animate as animate;
           
          echo feline\Cat::says(), "<br />\n";
            echo
          canine\Dog::says(), "<br />\n";
            echo \
          animate\Animal::breathes(), "<br />\n"?>
          up
          8
          varuninorbit at yahoo dot co dot in
          3 years ago
          here is a simple example to use namespace

          <?php

          namespace app\a{
              class
          one{
                 public static function
          _1(){
                  echo
          'a one _1<br>';
                 }
              }
          }

          namespace
          app\b{
              class
          one{
                  public static function
          _2(){
                      echo
          'b one _2<br>';
                  }
              }
          }

          namespace
          app{

              echo
          a\one::_1();
              echo
          b\one::_2();
              echo
          a\two::_1();
          }

          namespace
          app\a{
              class
          two{
                 public static function
          _1(){
                  echo
          'a two _1<br>';
                 }
              }
          }

          prints
          a one _1
          b one _2
          a two _1
          up
          4
          davidkennedy85 at gmail dot com
          4 years ago
          In addition to using namespaces and closures, the use keyword has another new meaning as of PHP 5.4 - using traits:

          <?php
          trait Hello {
              public function
          sayHello() {
                  echo
          'Hello ';
              }
          }

          trait
          World {
              public function
          sayWorld() {
                  echo
          'World';
              }
          }

          class
          MyHelloWorld {
              use
          Hello, World;
              public function
          sayExclamationMark() {
                  echo
          '!';
              }
          }

          $o = new MyHelloWorld();
          $o->sayHello();
          $o->sayWorld();
          $o->sayExclamationMark();
          ?>

          More info here: http://php.net/manual/en/language.oop5.traits.php
          up
          -50
          Ronald W
          4 years ago
          <?php
          // multiple namespaces in a single file:

          namespace foo{
            class
          Cat {
              static function
          says() {echo 'meoow';}  }
          }

          namespace
          bar{
            class
          Dog {
              static function
          says() {echo 'ruff';}  } 
            class
          Cat {
              static function
          says() {echo 'meowi';}  }
            class
          Mouse {     //nonstatic function
             
          function says() {echo 'Come and get me ;)';}  }
          }

          namespace
          animate{
            class
          Animal {
              static function
          breathes() {echo 'air';}  }
          }

          namespace{       
          // No Namespace: global code
           
          use foo as feline;
            use
          bar as canine;
            use
          bar\Mouse as MouseOnly;
            use
          animate;
            echo
          animate\Animal::breathes(), "<br />\n"
            echo
          feline\Cat::says(), "<br />\n"; //not starting with a slash!
           
          echo canine\Cat::says(), "<br />\n";
            echo
          canine\Dog::says(), "<br />\n";
           
          //any of the three following lines work:
            // $micky=new bar\Mouse();
            // $micky=new canine\Mouse();
           
          $micky=new test();
            echo
          $micky->says();
          }
          ?>

          备份地址:http://www.lvesu.com/blog/php/language.namespaces.php

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