file_get_contents (PHP) - alternative to javascript?

I don’t know if it will help or not, but here the site downloads the page to the server and parses different words in the body of the page: Definition of CMS

Browsers by default prohibit cross-domain requests using javascript - that is, you can not get content using javascript contained on another domain.

But, you can implement it like this: your website makes an ajax request (for example, using jquery $ .post ()) to your server -> then your server requests a third-party website using file_get_contents and returns the result in response to your ajax request -> then you can display it on the page

Below is an analogue of the php function.

Although I optimized the site myself, doing only content update on js, I do not use this feature. Did it yourself on ajax. If you know php, then read the ajax + php book and then you can do it yourself, I didn’t read this book myself, I read it for 5 hours and I had enough for this purpose.

 function file_get_contents (url, flags, context, offset, maxLen) { // Read the entire file into a string // // version: 906.111 // + input by: Jani Hartikainen // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + improved by: Brett Zamir (http://brett-zamir.me) // + input by: Raphael (Ao) RUDLER // + bugfixed by: Brett Zamir (http://brett-zamir.me) // % note 1: This function uses XmlHttpRequest and cannot retrieve resource from different domain without modifications. // % note 2: Synchronous by default (as in PHP) so may lock up browser. Can // % note 2: get async by setting a custom "phpjs.async" property to true and "notification" for an // % note 2: optional callback (both as context params, with responseText, and other JS-specific // % note 2: request properties available via 'this'). Note that file_get_contents() will not return the text // % note 2: in such a case (use this.responseText within the callback). Or, consider using // % note 2: jQuery's: $('#divId').load('http://url') instead. // % note 3: The context argument is only implemented for http, and only partially (see below for // % note 3: "Presently unimplemented HTTP context options"); also the arguments passed to // % note 3: notification are incomplete // * example 1: file_get_contents('http://kevin.vanzonneveld.net/pj_test_supportfile_1.htm'); // * returns 1: '123' // Note: could also be made to optionally add to global $http_response_header as per http://php.net/manual/en/reserved.variables.httpresponseheader.php var tmp, headers = [], newTmp = [], k = 0, i = 0, href = '', pathPos = -1, flagNames = 0, content = null, http_stream = false; var func = function (value) { return value.substring(1) !== ''; }; // BEGIN REDUNDANT this.php_js = this.php_js || {}; this.php_js.ini = this.php_js.ini || {}; // END REDUNDANT var ini = this.php_js.ini; context = context || this.php_js.default_streams_context || null; if (!flags) { flags = 0; } var OPTS = { FILE_USE_INCLUDE_PATH: 1, FILE_TEXT: 32, FILE_BINARY: 64 }; if (typeof flags === 'number') { // Allow for a single string or an array of string flags flagNames = flags; } else { flags = [].concat(flags); for (i = 0; i < flags.length; i++) { if (OPTS[flags[i]]) { flagNames = flagNames | OPTS[flags[i]]; } } } if (flagNames & OPTS.FILE_BINARY && (flagNames & OPTS.FILE_TEXT)) { // These flags shouldn't be together throw 'You cannot pass both FILE_BINARY and FILE_TEXT to file_get_contents()'; } if ((flagNames & OPTS.FILE_USE_INCLUDE_PATH) && ini.include_path && ini.include_path.local_value) { var slash = ini.include_path.local_value.indexOf('/') !== -1 ? '/' : '\\'; url = ini.include_path.local_value + slash + url; } else if (!/^(https?|file):/.test(url)) { // Allow references within or below the same directory (should fix to allow other relative references or root reference; could make dependent on parse_url()) href = this.window.location.href; pathPos = url.indexOf('/') === 0 ? href.indexOf('/', 8) - 1 : href.lastIndexOf('/'); url = href.slice(0, pathPos + 1) + url; } if (context) { var http_options = context.stream_options && context.stream_options.http; http_stream = !! http_options; } if (!context || http_stream) { var req = this.window.ActiveXObject ? new ActiveXObject('Microsoft.XMLHTTP') : new XMLHttpRequest(); if (!req) { throw new Error('XMLHttpRequest not supported'); } var method = http_stream ? http_options.method : 'GET'; var async = !! (context && context.stream_params && context.stream_params['phpjs.async']); if (ini['phpjs.ajaxBypassCache'] && ini['phpjs.ajaxBypassCache'].local_value) { url += (url.match(/\?/) == null ? "?" : "&") + (new Date()).getTime(); // Give optional means of forcing bypass of cache } req.open(method, url, async); if (async) { var notification = context.stream_params.notification; if (typeof notification === 'function') { // Fix: make work with req.addEventListener if available: https://developer.mozilla.org/En/Using_XMLHttpRequest if (0 && req.addEventListener) { // Unimplemented so don't allow to get here/* req.addEventListener('progress', updateProgress, false); req.addEventListener('load', transferComplete, false); req.addEventListener('error', transferFailed, false); req.addEventListener('abort', transferCanceled, false); */ } else { req.onreadystatechange = function (aEvt) { // aEvt has stopPropagation(), preventDefault(); see https://developer.mozilla.org/en/NsIDOMEvent // Other XMLHttpRequest properties: multipart, responseXML, status, statusText, upload, withCredentials /* PHP Constants: STREAM_NOTIFY_RESOLVE 1 A remote address required for this stream has been resolved, or the resolution failed. See severity for an indication of which happened. STREAM_NOTIFY_CONNECT 2 A connection with an external resource has been established. STREAM_NOTIFY_AUTH_REQUIRED 3 Additional authorization is required to access the specified resource. Typical issued with severity level of STREAM_NOTIFY_SEVERITY_ERR. STREAM_NOTIFY_MIME_TYPE_IS 4 The mime-type of resource has been identified, refer to message for a description of the discovered type. STREAM_NOTIFY_FILE_SIZE_IS 5 The size of the resource has been discovered. STREAM_NOTIFY_REDIRECTED 6 The external resource has redirected the stream to an alternate location. Refer to message . STREAM_NOTIFY_PROGRESS 7 Indicates current progress of the stream transfer in bytes_transferred and possibly bytes_max as well. STREAM_NOTIFY_COMPLETED 8 There is no more data available on the stream. STREAM_NOTIFY_FAILURE 9 A generic error occurred on the stream, consult message and message_code for details. STREAM_NOTIFY_AUTH_RESULT 10 Authorization has been completed (with or without success). STREAM_NOTIFY_SEVERITY_INFO 0 Normal, non-error related, notification. STREAM_NOTIFY_SEVERITY_WARN 1 Non critical error condition. Processing may continue. STREAM_NOTIFY_SEVERITY_ERR 2 A critical error occurred. Processing cannot continue. */ var objContext = { responseText: req.responseText, responseXML: req.responseXML, status: req.status, statusText: req.statusText, readyState: req.readyState, evt: aEvt }; // properties are not available in PHP, but offered on notification via 'this' for convenience // notification args: notification_code, severity, message, message_code, bytes_transferred, bytes_max (all int's except string 'message') // Need to add message, etc. var bytes_transferred; switch (req.readyState) { case 0: // UNINITIALIZED open() has not been called yet. notification.call(objContext, 0, 0, '', 0, 0, 0); break; case 1: // LOADING send() has not been called yet. notification.call(objContext, 0, 0, '', 0, 0, 0); break; case 2: // LOADED send() has been called, and headers and status are available. notification.call(objContext, 0, 0, '', 0, 0, 0); break; case 3: // INTERACTIVE Downloading; responseText holds partial data. bytes_transferred = req.responseText.length * 2; // One character is two bytes notification.call(objContext, 7, 0, '', 0, bytes_transferred, 0); break; case 4: // COMPLETED The operation is complete. if (req.status >= 200 && req.status < 400) { bytes_transferred = req.responseText.length * 2; // One character is two bytes notification.call(objContext, 8, 0, '', req.status, bytes_transferred, 0); } else if (req.status === 403) { // Fix: These two are finished except for message notification.call(objContext, 10, 2, '', req.status, 0, 0); } else { // Errors notification.call(objContext, 9, 2, '', req.status, 0, 0); } break; default: throw 'Unrecognized ready state for file_get_contents()'; } } } } } if (http_stream) { var sendHeaders = http_options.header && http_options.header.split(/\r?\n/); var userAgentSent = false; for (i = 0; i < sendHeaders.length; i++) { var sendHeader = sendHeaders[i]; var breakPos = sendHeader.search(/:\s*/); var sendHeaderName = sendHeader.substring(0, breakPos); req.setRequestHeader(sendHeaderName, sendHeader.substring(breakPos + 1)); if (sendHeaderName === 'User-Agent') { userAgentSent = true; } } if (!userAgentSent) { var user_agent = http_options.user_agent || (ini.user_agent && ini.user_agent.local_value); if (user_agent) { req.setRequestHeader('User-Agent', user_agent); } } content = http_options.content || null; /* // Presently unimplemented HTTP context options var request_fulluri = http_options.request_fulluri || false; // When set to TRUE, the entire URI will be used when constructing the request. (ie GET http://www.example.com/path/to/file.html HTTP/1.0). While this is a non-standard request format, some proxy servers require it. var max_redirects = http_options.max_redirects || 20; // The max number of redirects to follow. Value 1 or less means that no redirects are followed. var protocol_version = http_options.protocol_version || 1.0; // HTTP protocol version var timeout = http_options.timeout || (ini.default_socket_timeout && ini.default_socket_timeout.local_value); // Read timeout in seconds, specified by a float var ignore_errors = http_options.ignore_errors || false; // Fetch the content even on failure status codes. */ } if (flagNames & OPTS.FILE_TEXT) { // Overrides how encoding is treated (regardless of what is returned from the server) var content_type = 'text/html'; if (http_options && http_options['phpjs.override']) { // Fix: Could allow for non-HTTP as well content_type = http_options['phpjs.override']; // We use this, eg, in gettext-related functions if character set // overridden earlier by bind_textdomain_codeset() } else { var encoding = (ini['unicode.stream_encoding'] && ini['unicode.stream_encoding'].local_value) || 'UTF-8'; if (http_options && http_options.header && (/^content-type:/im).test(http_options.header)) { // We'll assume a content-type expects its own specified encoding if present content_type = http_options.header.match(/^content-type:\s*(.*)$/im)[1]; // We let any header encoding stand } if (!(/;\s*charset=/).test(content_type)) { // If no encoding content_type += '; charset=' + encoding; } } req.overrideMimeType(content_type); } // Default is FILE_BINARY, but for binary, we apparently deviate from PHP in requiring the flag, since many if not // most people will also want a way to have it be auto-converted into native JavaScript text instead else if (flagNames & OPTS.FILE_BINARY) { // Trick at https://developer.mozilla.org/En/Using_XMLHttpRequest to get binary req.overrideMimeType('text/plain; charset=x-user-defined'); // Getting an individual byte then requires: // responseText.charCodeAt(x) & 0xFF; // throw away high-order byte (f7) where x is 0 to responseText.length-1 (see notes in our substr()) } if (http_options && http_options['phpjs.sendAsBinary']) { // For content sent in a POST or PUT request (use with file_put_contents()?) req.sendAsBinary(content); // In Firefox, only available FF3+ } else { req.send(content); } tmp = req.getAllResponseHeaders(); if (tmp) { tmp = tmp.split('\n'); for (k = 0; k < tmp.length; k++) { if (func(tmp[k])) { newTmp.push(tmp[k]); } } tmp = newTmp; for (i = 0; i < tmp.length; i++) { headers[i] = tmp[i]; } this.$http_response_header = headers; // see http://php.net/manual/en/reserved.variables.httpresponseheader.php } if (offset || maxLen) { if (maxLen) { return req.responseText.substr(offset || 0, maxLen); } return req.responseText.substr(offset); } return req.responseText; } return false; }