PHP的数组排序用法和例子

数组排序

PHP - 数组排序函数

• sort() - 对数组进行升序排列
• rsort() - 对数组进行降序排列
• asort() - 根据关联数组的值，对数组进行升序排列
• ksort() - 根据关联数组的键，对数组进行升序排列
• arsort() - 根据关联数组的值，对数组进行降序排列
• krsort() - 根据关联数组的键，对数组进行降序排列

  //sort()
  $cars=array("Volvo","BMW","Toyota");
  sort($cars);
  
  $clength=count($cars);
  for($x=0;$x<$clength;$x++)
  {
      echo $cars[$x];
      echo "<br>";
  }
  
  //rsort()   
  $cars=array("Volvo","BMW","Toyota");
  rsort($cars);   
  
  //asort() arsort() 关联数组排序 value
  $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
  asort($age);
  arsort($age);
  
  //ksort() krsort() 关联数组排序 key
  $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
  ksort($age);
  krsort($age);
  ?>
  

  数组

  <?php
  $cars=array("Volvo","BMW","Toyota"); //数组定义 数值数组
  echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . "."; //访问数组元素
  
  //数组长度count()
  $cars=array("Volvo","BMW","Toyota");
  echo count($cars); //count() 函数用于返回数组的长度
  
  //遍历数值数组
  $cars=array("Volvo","BMW","Toyota");
  $arrlength=count($cars);
  
  for($x=0;$x<$arrlength;$x++)
  {
      echo $cars[$x];
      echo "<br>";
  }
  
  $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");//定义关联数组
  echo "Peter is " . $age['Peter'] . " years old.";
  
  //遍历关联数组
  $age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
  foreach($age as $x=>$x_value)
  {
      echo "Key=" . $x . ", Value=" . $x_value;
      echo "<br>";
  }
  ?>