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

Recommendations

Info

132 ” CSS Selector Libraries H i e r a r c h i c a l Selectors N o w let’s move on to hierarchical selectors, which use document structure as a way to select elements, using the previous markup example. • body ul would select all ul elements that are descendants of body elements. • ul > li would select all li elements that are children of ul elements. • ul + img would select all img elements that immediately follow a ul sibling element (i.e. are their next sibling). • ul ˜ img would select all img elements that follow a ul sibling element (i.e. come after them and have the same parent node). The third and fourth items in this list probably look fairly similar. The difference is in the word “immediately.” By this example, the third item in the list would only select the Advertisment #1 image because it comes immediately after its ul sibling element in the document. The fourth item in the list, on the other hand, would select both images because both follow their ul sibling element. Selector CSS XPath ancestor descendant body ul bodyul parent > child ul > li //ul/li prev + next ul + img //ul/following-sibling::img[1] prev ˜ siblings ul ˜ img //ul/following-sibling::img Basic F i l t e r s The selectors reviewed up to this point in the chapter have always changed the type of nodes being selected. Conversely, when a filter is appended to an expression, it merely restricts the returned set of nodes to a subset of those matching the original expression. N o t e that available filters vary per library. Su p p o r t for filters in jQuery is fairly comprehensive and as such it is used as the primary reference for sections related to filters in this chapter.
CSS Selector Libraries ” 133 • li:first selects only the first li node found in the document. • li:last likewise selects the last li node found in the document. • li:even selects all evenly positioned nodes in the document beginning from 0. • li:odd likewise selects all oddly positioned nodes in the document, also beginning from 0. • li:eq(0) selects the li node with a position of 0 within the set of li nodes (i.e. the first one) in the document. • li:gt(0) selects all li nodes with a position greater than 0 within the set of li nodes (i.e. all but the first one) in the document. • li:lt(1) selects all li nodes with a position less than 1 within the set of li nodes (i.e. the first one) in the document. • :header matches all header nodes. (i.e. h1, h2, etc.) • :not(:first) negates the :first selector and thus selects all li nodes except the first one in the document. Selector CSS XPath first node li:first //li[1] last node li:last //li[last()] even nodes li:even //li[position() mod 2 = odd nodes li:odd //li[position() mod 2 = specific node li:eq(0) //li[1] all nodes after li:gt(0) //li[position() > 1] all nodes before li:lt(1) //li[position() < 2] header nodes :header //h1|//h2|//h3|//h4|//h5| 0] 1] all nodes not matching an expression //h6 :not(:first) //*[not(position() = 1)]
Page 1 and 2:
php|architect’s Guide to Web Scra
Page 3:
php|ar chitect’s Guide to W eb Sc
Page 7 and 8:
vi ” CONTENTS Referring URLs . .
Page 9 and 10:
viii ” CONTENTS HTTP Authenticati
Page 11:
x ” CONTENTS Chapter 14 — PCRE
Page 15 and 16:
xiv ” CONTENTS pleted. Each had a
Page 18 and 19:
For ewor d W eb scraping is the fut
Page 21 and 22:
Chapter 1 Introduction If you are l
Page 23 and 24:
Introduction ” 3 in some instance
Page 25:
Introduction ” 5 • Chapters 3-7
Page 28 and 29:
8 ” HTTP R equests The HTTP proto
Page 30 and 31:
10 ” HTTP http://en.wikipedia.org
Page 32 and 33:
12 ” HTTP i Query String Limits M
Page 34 and 35:
14 ” HTTP Server: Apache X-Powere
Page 36 and 37:
16 ” HTTP set, it will persist fo
Page 38 and 39:
18 ” HTTP Content Caching Two met
Page 40 and 41:
20 ” HTTP as 0-499. To specify fr
Page 42 and 43:
22 ” HTTP • Initialize a reques
Page 44:
24 ” HTTP W rap-U p At this point
Page 49 and 50:
HTTP Streams W rapper ” 29 Let
Page 51 and 52:
HTTP Streams W rapper ” 31 Error
Page 53:
HTTP Streams W rapper ” 33 ); ?>
Page 56 and 57:
36 ” cURL Extension Simple R eque
Page 58 and 59:
38 ” cURL Extension Setting M ult
Page 60 and 61:
40 ” cURL Extension • CURLOPT_R
Page 62 and 63:
42 ” cURL Extension containing th
Page 64 and 65:
44 ” cURL Extension operate unpre
Page 66:
46 ” cURL Extension • The sessi
Page 70 and 71:
50 ” pecl_http PECL Extension bal
Page 72 and 73:
52 ” pecl_http PECL Extension •
Page 74 and 75:
54 ” pecl_http PECL Extension Deb
Page 76 and 77:
56 ” pecl_http PECL Extension ass
Page 78 and 79:
58 ” pecl_http PECL Extension );
Page 81 and 82:
Chapter 6 P EAR::HTTP_Client The PH
Page 83 and 84:
PEAR::HTTP_Client ” 63 • sendRe
Page 85 and 86:
PEAR::HTTP_Client ” 65 • By def
Page 87 and 88:
PEAR::HTTP_Client ” 67 } ?> $url
Page 89:
PEAR::HTTP_Client ” 69 • http:/
Page 92 and 93:
72 ” Zend_Http_Client // Another
Page 94 and 95:
74 ” Zend_Http_Client Configurat
Page 96 and 97:
76 ” Zend_Http_Client getLastResp
Page 98:
78 ” Zend_Http_Client HTTP A uthe
Page 102 and 103: 82 ” Rolling Y o u Own r $stream
Page 104 and 105: 84 ” Rolling Y o u Own r Logic to
Page 106: 86 ” Rolling Y o u Own r See RFC
Page 110 and 111: 90 ” T i d y Extension direct inp
Page 112 and 113: 92 ” T i d y Extension public fun
Page 114 and 115: 94 ” T i d y Extension There are
Page 116: 96 ” T i d y Extension Output Obt
Page 120 and 121: 100 ” DOM Extension T y p of P e
Page 122 and 123: 102 ” DOM Extension ties include
Page 124 and 125: 104 ” DOM Extension // A slightly
Page 126 and 127: 106 ” DOM Extension // Also retur
Page 128 and 129: 108 ” DOM Extension • //@id add
Page 130: 110 ” DOM Extension • DOM Level
Page 134 and 135: 114 ” SimpleXML Extension The co
Page 136 and 137: 116 ” SimpleXML Extension foreach
Page 138: 118 ” SimpleXML Extension W r a
Page 142 and 143: 122 ” XMLReader Extension Loading
Page 144 and 145: 124 ” XMLReader Extension false o
Page 146 and 147: 126 ” XMLReader Extension cate to
Page 149 and 150: Chapter 13 CSS Selector Libraries T
Page 151: CSS Selector Libraries ” 131 Abou
Page 155 and 156: CSS Selector Libraries ” 135 •
Page 157 and 158: CSS Selector Libraries ” 137 •
Page 159 and 160: CSS Selector Libraries ” 139 It
Page 163 and 164: Chapter 14 PCRE Extension There are
Page 165 and 166: PCRE Extension ” 145 Anchors Y o
Page 167 and 168: PCRE Extension ” 147 // Matches
Page 169 and 170: PCRE Extension ” 149 if (preg_mat
Page 171 and 172: PCRE Extension ” 151 The first wa
Page 173 and 174: PCRE Extension ” 153 • T ouse a
Page 177 and 178: T i p sand T r i c k s Chapter 15 C
Page 179 and 180: T i p s and T r i c ” k 159 s not
Page 181 and 182: T i p s and T r i c ” k 161 s W e
Page 185 and 186: A p p e n d i x A Legality of W e S
Page 187: Legality of W e b Scraping ” 167
Page 190 and 191: 170 ” M u l t i p r o c e s s i n
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?