php|architect's Guide to Web Scraping with PHP - Wind Business ...

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CONTENTS ” ix Chapter 11 — SimpleXML Extension 113 Loading a Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Accessing Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Accessing Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 Comparing N odes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 DOM Interoperability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 XP ath . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 W rap-U p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 Chapter 12 — XMLReader Extension 121 Loading a Document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Iteration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 N odes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Elements and Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 DOM Interoperation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Closing Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 W rap-U p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Chapter 13 — CSS Selector Libraries 129 Reason to U se Them . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 Hierarchical Selectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Basic Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132 Content Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 Attribute Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 Child Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 F orm Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 Libraries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 PHP Simple HTML DOM P arser . . . . . . . . . . . . . . . . . . . . . . . 138 Zend_Dom_Query . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 phpQuery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 DOMQuery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 W rap-U p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
x ” CONTENTS Chapter 14 — PCRE Extension 143 P attern Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 Anchors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Alternation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Repetition and Quantifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Subpatterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Escaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Escape Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 M odifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 W rap-U p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 Chapter 15 — T ips and Tricks 157 Batch J obs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157 A vailability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 P arallel Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 Crawlers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 F orms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159 W eb Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161 That’s All F olks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162 Appendix A — Legality of W eb Scraping 165 Chapter B — M ultiprocessing 169
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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 ” 133 •
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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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