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64 ” PEAR::HTTP_Client individual parameters modified only as needed to change what differs between consecutive requests. To “start fresh” with an existing request instance, simply explicitly call its constructor method. Juggling Data HTTP_Request makes data management pretty easy and straightforward, so it’s all co v- ered in this section. • addRawQueryString isn’t named very intuitively, as it actually o verwrites any query string that you ’ve previously set.
PEAR::HTTP_Client ” 65 • By default, addQueryString and addPostData will URL-encode the variable value. To prevent this if your data is already pre-encoded, pass the value true as the third parameter to either method. • clearPostData and clearCookies reset internal variables used to store data passed in by addQueryString and addPostData respectively. • setURL and addQueryString or addRawQueryString can be used together to control the content of the internal variable for the URL of the request. getURL can be used to see the effects of these during development. • addFile is intended to simulate uploading a file via a file input field in an HTML form. F or forms with multiple file upload files with the same name, pass an array of file paths as the second parameter and (optionally) an array of corresponding file MIME types as the third parameter. • To send the contents of a file as the entire body of a request, use file_get_contents to retrieve the file contents into a string and pass that to the setBody method of the request instance. W rangling H eaders Handling headers is also relatively straightforward. The only header-specific convenience method that’s included is for handling Basic HTTP authentication, as sho wn belo w .
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vi ” CONTENTS Referring URLs . .
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viii ” CONTENTS HTTP Authenticati
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x ” CONTENTS Chapter 14 — PCRE
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xiv ” CONTENTS pleted. Each had a
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For ewor d W eb scraping is the fut
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Chapter 1 Introduction If you are l
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Introduction ” 3 in some instance
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Introduction ” 5 • Chapters 3-7
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8 ” HTTP R equests The HTTP proto
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10 ” HTTP http://en.wikipedia.org
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Chapter 13 CSS Selector Libraries T
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CSS Selector Libraries ” 131 Abou
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CSS Selector Libraries ” 139 It
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Chapter 14 PCRE Extension There are
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PCRE Extension ” 145 Anchors Y o
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PCRE Extension ” 147 // Matches
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PCRE Extension ” 149 if (preg_mat
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PCRE Extension ” 151 The first wa
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PCRE Extension ” 153 • T ouse a
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T i p s and T r i c ” k 159 s not
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A p p e n d i x A Legality of W e S
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