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实例演示php数组的常用函数
吴长清
Original
358 people have browsed it

1.常用函数（课外）

1.1 array_rand()：从数组中随机取出一个或多个随机键

  1. $arr =  ['id' => 1, 'name' => '赵大', 'email' => 'zhaoda@qq.com', 'hello', 'php', 'js'];
  2. printf('原数组: <pre>%s</pre>', print_r($arr, true));
  3. echo '<hr>';
  4. // 1.array_rand(数组，要取出的单元数量):  从数组中随机取出一个或多个随机键
  5. printf('1.随机取出键名: <pre>%s</pre>', print_r(array_rand($arr, 3),true));

1.2 array_flip()：交换数组中的键和值

  1. $arr =  ['id' => 1, 'name' => '赵大', 'email' => 'zhaoda@qq.com', 'hello', 'php', 'js'];
  2. printf('原数组: <pre>%s</pre>', print_r($arr, true));
  3. echo '<hr>';
  4. // 2.array_flip(数组)
  5. printf('2.交换数组中的键和值: <pre>%s</pre>', print_r(array_flip($arr),true));

1.3 array_diff()：计算数组的差集

  1. // 3.array_diff(数组): 计算数组的差集 
  2. $array1 = array("a" => "green", "red", "blue", "red");
  3. $array2 = array("b" => "green", "yellow", "red");
  4. printf('数组1: <pre>%s</pre>', print_r($array1,true));
  5. printf('数组2: <pre>%s</pre>', print_r($array2,true));
  6. // 数组$array1中的值与数组$array2中的值做对比，返回$array2中没有$array1中的值
  7. $result = array_diff($array1, $array2);
  8. printf('数组1与数组2的差集: <pre>%s</pre>', print_r($result,true));

1.4 array_combine(): 创建一个数组，用一个数组的值作为其键名，另一个数组的值作为其值

  1. //4.array_combine(): 创建一个数组，用一个数组的值作为其键名，另一个数组的值作为其值
  2. $arr1 = ['id', 'name', 'email'];
  3. $arr2 = [1, '赵大', 'zhaoda@qq.com'];
  4. printf('数组1: <pre>%s</pre><hr>', print_r($arr1, true));
  5. printf('数组2: <pre>%s</pre><hr>', print_r($arr2, true));
  6. $result = array_combine($arr1, $arr2);
  7. printf('用一个数组的值作为其键名，另一个数组的值作为其值: <pre>%s</pre>', print_r($result, true));

1.5 array_intersect(): 计算数组的交集

  1. // 5.array_intersect(): 计算数组的交集
  2. $array1 = array("a" => "green", "red", "blue", "red");
  3. $array2 = array("b" => "green", "yellow", "red");
  4. printf('数组1: <pre>%s</pre>', print_r($array1,true));
  5. printf('数组2: <pre>%s</pre>', print_r($array2,true));
  6. $result = array_intersect($array1, $array2);
  7. printf('数组1与数组2的交集: <pre>%s</pre>', print_r($result,true));

1.6 array_reverse(): 返回单元顺序相反的数组

  1. // 6.array_reverse(): 返回单元顺序相反的数组 
  2. $arr =  ['id' => 1, 'name' => '赵大', 'email' => 'zhaoda@qq.com', 'hello', 'php', 'js'];
  3. printf('原数组: <pre>%s</pre> <hr>', print_r($arr, true));
  4. printf('取反数组: <pre>%s</pre> <hr>', print_r(array_reverse($arr), true));

2.队列

  1. <body>
  2.     <fieldset class="list">
  3.         <legend>尾部追加 头部删除</legend>
  4.         <?php $arr = [1, 2, 3, 4, 5];
  5.         foreach ($arr as $value) :  ?>
  6.             <div class="box"> <?= $value ?></div>
  7.         <?php endforeach ?>
  8.         <?php
  9.         echo "<hr>";
  10.         array_push($arr, $arr[count($arr) - 1] + 1);
  11.         array_shift($arr);
  12.         ?>
  13.         <?php foreach ($arr as $value) :  ?>
  14.             <div class="box"> <?= $value ?></div>
  15.         <?php endforeach ?>
  16.         <?php
  17.         echo "<hr>";
  18.         array_push($arr, $arr[count($arr) - 1] + 1);
  19.         array_shift($arr);
  20.         ?>
  21.         <?php foreach ($arr as $value) :  ?>
  22.             <div class="box"> <?= $value ?></div>
  23.         <?php endforeach ?>
  24.         <?php
  25.         echo "<hr>";
  26.         array_push($arr, $arr[count($arr) - 1] + 1);
  27.         array_shift($arr);
  28.         ?>
  29.         <?php foreach ($arr as $value) :  ?>
  30.             <div class="box"> <?= $value ?></div>
  31.         <?php endforeach ?>
  32.     </fieldset>
  34.     <fieldset class="list">
  35.         <legend>头部追加  尾部删除</legend>
  36.         <?php $arr = [1, 2, 3, 4, 5];
  37.         foreach ($arr as $value) :  ?>
  38.             <div class="box2"> <?= $value ?></div>
  39.         <?php endforeach ?>
  40.         <?php
  41.         echo "<hr>";
  42.         array_unshift($arr, $arr[0] - 1);
  43.         array_pop($arr);
  44.         ?>
  45.         <?php foreach ($arr as $value) :  ?>
  46.             <div class="box2"> <?= $value ?></div>
  47.         <?php endforeach ?>
  48.         <?php
  49.         echo "<hr>";
  50.         array_unshift($arr, $arr[0] - 1);
  51.         array_pop($arr);
  52.         ?>
  53.         <?php foreach ($arr as $value) :  ?>
  54.             <div class="box2"> <?= $value ?></div>
  55.         <?php endforeach ?>
  56.         <?php
  57.         echo "<hr>";
  58.         array_unshift($arr, $arr[0] - 1);
  59.         array_pop($arr);
  60.         ?>
  61.         <?php foreach ($arr as $value) :  ?>
  62.             <div class="box2"> <?= $value ?></div>
  63.         <?php endforeach ?>
  64.     </fieldset>
  65. </body>

Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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