Language Notes - total325Chapter | Hongmu Notes

PHP – Query a single SQL record Language Notes PHP PHP and mysql

You can use the mysqli or PDO extensions in PHP to query a single SQL record. Below are example codes for both methods: Using the mysqli extension to query a single SQL record: // Establish a connection $conn = mysqli_connect("localhost", "username", "password", "dbname"); // Check the connection...

2023-02-24 13:07:37 👁 126

PHP connects to a database and executes SQL statements. Language Notes PHP PHP and mysql

In PHP, connecting to a database and executing SQL statements can be done through the following steps: Connect to the database using the `mysqli::connect()` function or the `PDO` class. For example: // Connect to the database using mysqli $servername = "localhost"; $username = "username"; $...

2023-02-24 12:15:24 👁 192

PHP – Extract the content between two specified strings from a web page. Language Notes PHP PHP collection

To extract the content between two specified strings from a web page, you can use the following regular expression: $pattern = '/string1(.*?)string2/is'; This regular expression matches the content between string1 and string2 and uses the (.*?) quantifier to capture that content. Here is an example code snippet: // Extract the HTML content from the target URL...

2023-02-23 23:00:19 👁 283

PHP regular expression matching for the website's body section Language Notes PHP PHP collection

To match the <body> tag and its internal content on a website, you can use the following regular expression: $pattern = '<body[^>]*>(.*?)<\/body>/'; This regular expression matches the <body> tag and its internal content, where.*? represents a non-greedy match for any character.

2023-02-23 22:57:19 👁 305

PHP regular matches all href links Language Notes PHP PHP collection

In HTML, links usually appear as <a> tags, whose href attribute represents the address of the link. You can use regular expressions to match <a> tags and extract the href attribute value within them. Here is an example regular expression: $pattern = '/<a\s[^>]*href=([\'"])(.*?…

2023-02-23 22:54:23 👁 483

What should I do if the target website detects that I am using the IE browser during PHP data scraping? Language Notes PHP PHP collection

If the target website determines your browser type by examining the User-Agent header information, you can try modifying the User-Agent header to simulate access from another browser, thereby bypassing the website's detection mechanism. In PHP, you can use the cURL library to send HTTP requests and set the User-Agent header. Here is an example code snippet: // Set the target...

2023-02-23 22:50:38 👁 204

PHP forges request headers to collect web pages Language Notes PHP PHP collection

In PHP, the cURL library can be used to simulate the sending of HTTP requests and configure request headers, thereby forging headers for web page scraping. Here is an example of the code: // Create a cURL handle $ch = curl_init(); // 设置请求 URL curl_setopt($ch; curl_setopt($ch, CURLOPT_URL, 'https://...');

2023-02-23 22:46:50 👁 239

PHP uses regular expressions to match <a> links within web pages. Language Notes PHP PHP collection

Regular expressions can be used to match hyperlinks within HTML; here is an example code: $html = '<html><body><a href="https://www.example.com">Example</a></body></html>...

2023-02-23 22:42:59 👁 207

PHP uses the DOM extension to match <a> links within web pages. Language Notes PHP PHP collection

To match all links (a tags) within a web page, you can use PHP's DOM extension library to parse the HTML document and extract the links. Here is an example code: // Load an HTML page from a specified URL $html = file_get_contents(' http://www.example.com/'); // Create a DOM...

2023-02-23 22:36:56 👁 167

PHP uses regular expressions to scrape matching web pages and extract data. Language Notes PHP PHP collection

The built-in PHP function `preg_match()` can be used to perform regular expression matching. Below is an example function where the first parameter is the regular expression and the second parameter is the string to match: `function match_regex($pattern, $subject) {if (preg_match($pattern, $subject,...)

2023-02-23 22:34:34 👁 226