php抓取页面内容
先抓取一个页面内有用的链接,再抓取页面上链接的内容,用for循环,可是循环到第二次的时候就出错,
想了半天,不知道问题出在哪,请各位大神帮忙看下。
$url = 'http://www.meishij.net/chufang/diy/?page=1#listnav';$opts = array( 'http'=>array( 'user_agent' => "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)", ) ); $context = stream_context_create($opts); $con = file_get_contents("$url", false, $context);//条目$preg ='#<strong class="title"><a target="_blank" title="(.*)" href="(.*)">(.*)</a></strong>#'; preg_match_all($preg, $con, $arr); //搜索内容赋值给数组 for($i=0;$i<20;$i++) //单页面截取{ //print_r($arr[0][$i]); $ss=$arr[2][$i]; echo $ss; echo "</br>"; $opts = array( 'http'=>array( 'user_agent' => "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)", ) ); $context = stream_context_create($opts); $cons = file_get_contents("$ss", false, $context);//标题$preg ='#<h2 id="">(.*)</h2>#'; preg_match_all($preg, $cons, $arr); //搜索内容赋值给数组 print_r($arr[0][0]);//内容$preg ='#<p><em class=(.*)>(.*)</em>(.*)</p>#'; preg_match_all($preg, $cons, $arr); //搜索内容赋值给数组 print_r($arr[0][0]);echo "</br>";print_r($arr[0][1]);echo "</br>";print_r($arr[0][2]);echo "</br>";//图片$preg ='#<p><img class="conimg lazy" src="/static/imghw/default1.png" data-src="(.*)" alt="(.*)" style="max-width:90%" height="(.*)" /></p>#'; preg_match_all($preg, $cons, $arr); //搜索内容赋值给数组 print_r($arr[0][0]);echo "</br>";print_r($arr[0][1]);echo "</br>";print_r($arr[0][2]);echo "</br>";print_r($arr[0][3]);echo "</br>";print_r($arr[0][4]);echo "</br>";print_r($arr[0][5]);echo "</br>";print_r($arr[0][6]); }
回复讨论(解决方案)
哪位高手知道告诉下,3Q、
求解,为啥循环不过去。
print_r $arr;//看看$arr什么内容
preg_match_all($preg, $con, $arr); //搜索内容赋值给数组
for($i=0;$i {
//print_r($arr[0][$i]);
$ss=$arr[2][$i];
echo $ss;
echo "";
$opts = array(
'http'=>array(
'user_agent' => "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)",
)
);
$context = stream_context_create($opts);
$cons = file_get_contents("$ss", false, $context);
print_r($cons);
die();
//标题
$preg ='#
(.*)
#';preg_match_all($preg, $cons, $arr); //搜索内容赋值给数组
print_r($arr[0][0]);
//内容
$preg ='#
(.*)(.*)
#';preg_match_all($preg, $cons, $arr); //搜索内容赋值给数组
print_r($arr[0][0]);
echo "";
看上面的红色部分,循环内和循环外的数组名是同一个,不会有问题么?

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

Alipay PHP...

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.

The enumeration function in PHP8.1 enhances the clarity and type safety of the code by defining named constants. 1) Enumerations can be integers, strings or objects, improving code readability and type safety. 2) Enumeration is based on class and supports object-oriented features such as traversal and reflection. 3) Enumeration can be used for comparison and assignment to ensure type safety. 4) Enumeration supports adding methods to implement complex logic. 5) Strict type checking and error handling can avoid common errors. 6) Enumeration reduces magic value and improves maintainability, but pay attention to performance optimization.

The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.

How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...

Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
