How to query specified elements in an array in PHP

The array_search() function searches for a given value in the array and returns the key value if found, otherwise it returns false. Prior to PHP 4.2.0, functions returned null instead of false on failure.

The syntax is as follows

mixed aarray_search(mixed needle，array haystack [，bool strict])

The parameter needle specifies the value to be searched in the array; the parameter haystack specifies the array to be searched; the parameter strict is an optional parameter. If the value is true, it will also be included in the array. Checks the type of a given value.

The following example comprehensively applies array functions to update the values ​​of elements in the array. The specific example code is as follows:

<?php
header("Content-Type:text/html; charset=utf-8");

$name ="智能机器人@数码相机@天翼 3G 手机@瑞士手表"; //定义字符串
$price = "14998@2588@266@66698";
$counts = "1@2@3@4";
$arrayid = explode("@",$name);                         //将商品 ID的字符串转换到数组中
$arraynum = explode("@",$price);                        //将商品价格的字符串转换到数组中
$arraycount = explode("@",$counts);                      //将商品数量的字符串转换到数组中

if($_POST){
    $id = $_POST["name"];                                //获取要更改的元素名称
    $num = $_POST["counts"];                            //获取要更改的值
    $key = array_search($id,$arrayid);           //在数组中搜索给定的值，如果成功返回键名
    $arraycount[$key]=$num;                      //更改商品数量
    $counts= implode("@",$arraycount);          //更改后的商品数量添加到购物车中
}
?>

<table width="580" border="1" cellpadding="1" cellspacing="1" bordercolor="#FFFFFF" bgcolor="#c17e50">
    <tr>
        <td width="145" class="STYLE1" align="center" bgcolor="#FFFFFF">商品名称</td>
        <td width="145" class="STYLE1" align="center" bgcolor="#FFFFFF">价    格</td>
        <td width="145" class="STYLE1" align="center" bgcolor="#FFFFFF">数    量</td>
        <td width="145" class="STYLE1" align="center" bgcolor="#FFFFFF">金    额</td>
    </tr>
  <?php
  for($i=0;$i<count($arrayid);$i++) {   //for循环读取数组中的数据
      ?>
      <form name="form_<?php echo $i ?>" method="post" action="2.php">
          <tr>
              <td height="25" class="STYLE2" align="center" bgcolor="#FFFFFF"><?php echo $arrayid[$i]; ?></td>
              <td class="STYLE2" align="center" bgcolor="#FFFFFF"><?php echo $arraynum[$i]; ?></td>
              <td class="STYLE2" align="center" bgcolor="#FFFFFF">
                  <input name="counts" type="text" id="counts" value="<?php echo $arraycount[$i]; ?>" size="8">
                  <input name="name" type="hidden" id="name" value="<?php echo $arrayid[$i]; ?>">
                  <input name="Submit" type="submit" value="更改">
              </td>
              <td class="STYLE2" align="center"><?php echo $arraycount[$i] * $arraynum[$i]; ?></td>

          </tr>
      </form>
  <?php
  }
    ?>
</table>

The running result is:

In the above example, the array function is comprehensively applied to modify the number of commodities stored in the array. The above picture is the running result!

Description: The most common application of the array_search() function is the shopping cart, which allows you to modify and delete the specified number of items in the shopping cart!

【Related tutorial recommendations】

1. Relevant topic recommendations: "php array (Array) 》

The above is the detailed content of How to query specified elements in an array in PHP. For more information, please follow other related articles on the PHP Chinese website!