PHP数组基础

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    <?php      $n = array (1,2,3,4,5);      //echo $n[0];      //echo $n[1];      //echo $n[2];      //echo $n[3];            //Ctrl + /      //Ctrl + d 删除当前行                        $var = "OH";      //内插 双引号 和单引号的区别      //$str1 = "a$varsdf"; 错误的，这是大括号的作用      $str1 = "a${var}sdf";      $str2 = 'a$varsdf';            echo $str1;      echo "<br/>";      echo $str2;            echo "<br/>==============================<br/>\n";      //变量名规则:a-z A-Z 0-9 _      echo "$str1$str2";      echo "<br/>==============================<br/>\n";      //字符串拼接用 点(.)      echo $str1.$str2;            echo "<br/>==============================<br/>\n";      //整数与字符串连接      $value = 12345;      echo $value;      echo "<br/>==============================<br/>\n";      echo "$str1$value$str2";      echo "<br/>==============================<br/>\n";      echo $str1.$value.$str2;      echo "<br/>==============================<br/>\n";      //整数与整数连接      $value2 = 456;      $value3 = 789;      echo $value2.$value3;      echo "<br/>==============================<br/>\n";      echo $n[0].$n[1];      echo "<br/>==============================<br/>\n";            $a = array("aaa", "bbb","ccc");      print_r($a);//打印数组的 函数语法      echo "<br/>==============================<br/>\n";      //关联数组            $a1 = array("aaa"=>123,"bbb"=>234,"ccc"=>678);//"aaa"是数组下标      print_r($a1);      echo "<br/>\n";      echo $a1["bbb"];      echo "<br/>\n";      //嵌套数组      $aa = array("aaa"=>array("AAA"=>1, "BBB"=>2, "CCC"=>array(6,7,8)), "bbb"=>"BBB");      print_r($aa);            echo "<br/>\n";      //用for循环访问数组n      for ($i=0;$i<count($n);$i++)      {          echo $n[$i];          echo "<br/>\n";      }      //用foreach访问关联数组       foreach ($a1 as $k=>$v)      {          echo $v;          br();          br();          echo $k;          br();          br();            }       function br ()//定义函数      {          echo "<br/>\n";      }      ?>
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