What's the difference between `curl` and `file_get_contents` for fetching web pages? Which one is better?

curl 和 file_get_contents These are PHP functions used for accessing network resources. They serve the same purpose, but there are some differences in their implementation and usage.

curl It is a versatile network request tool that supports multiple protocols (including HTTP, HTTPS, FTP, etc.) and allows for the configuration of various options and parameters. curl By initiating a request, you can more flexibly control various aspects of the request—such as request headers, request body, request method, and so on. Therefore, if you need to exercise finer-grained control over the request during its transmission, or if you need to implement advanced features (such as using a proxy server, setting timeout values, configuring request retries, etc.), then curl It might be a better option.

file_get_contents This is a simpler and more convenient network request function, primarily used for retrieving file content over HTTP or FTP protocols. Usage: file_get_contents Many tedious configurations and parameters can be omitted; simply pass the URL you wish to request. If you only need to retrieve simple web page content without requiring any additional control over the request, then file_get_contents It might be a better option.

Please note that if you are using it file_get_contents When the URL to be accessed uses the HTTPS protocol, the OpenSSL extension must be enabled in the PHP environment, and this setting must be configured in the PHP ini file. allow_url_fopen Option: 1.this is because file_get_contents When accessing the HTTPS protocol, the OpenSSL library is used for encrypted communication, and content must be read from the URL. allow_url_fopen The option is disabled by default; it must be enabled manually for the feature to work properly.

In conclusion, depending on the specific application scenario, different network request tools can be selected. For applications requiring high flexibility and control, a particular tool may be chosen. curlIf you simply need to retrieve web page content, you may choose this option. file_get_contents。