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!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1667
14
1426
52
1328
25
1273
29
1255
24
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
