PHP MySQL - Stilson.net

More documents

Recommendations

Info

CHAPTER 14• AUTHENTICATING YOUR USERSwww.it-ebooks.infocombinations you regularly use; my guess is that you have at least 12 such combinations, including e-mail, workstations, servers, bank accounts, utilities, online commerce, and securities brokerages.Because your application will assumedly add yet another login pair to the user’s list, a simple,automated mechanism should be in place for retrieving or resetting the user’s password should it beforgotten. This section examines one such mechanism, referred to as a one-time URL.A one-time URL is commonly given to a user to ensure uniqueness when no other authenticationmechanisms are available, or when the user would find authentication perhaps too tedious for the taskat hand. For example, suppose you maintain a list of newsletter subscribers and want to know which andhow many subscribers are acting on something they’ve read in the newsletter. One of the most commonways to make this determination is to offer them a one-time URL pointing to the newsletter, whichmight look like this:http://www.example.com/newsletter/0503.php?id=9b758e7f08a2165d664c2684fddbcde2In order to know exactly which users showed interest in the newsletter issue, a unique ID parameterlike the one shown in the preceding URL has been assigned to each user and stored in some subscriberstable. Such values are typically pseudorandom, derived using <strong>PHP</strong>’s md5() and uniqid() functions, likeso:$id = md5(uniqid(rand(),1));The subscribers table might look something like the following:CREATE TABLE subscribers (id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,email VARCHAR(255) NOT NULL,hash CHAR(32) NOT NULL,read CHAR);When the user clicks this link, causing the newsletter to be displayed, the following query willexecute before displaying the newsletter:UPDATE subscribers SET read='Y' WHERE hash='9b758e7f08a2165d664c2684fddbcde2'";The result is that you will know exactly which subscribers showed interest in the newsletter.This very same concept can be applied to password recovery. To illustrate how this is accomplished,consider the revised logins table shown in Listing 14-9.Listing 14-9. A Revised logins TableCREATE TABLE logins (id TINYINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,email VARCHAR(55) NOT NULL,username VARCHAR(16) NOT NULL,pswd CHAR(32) NOT NULL,hash CHAR(32) NOT NULL);Suppose one of the users in this table forgets his password and thus clicks the Forgot password?link, commonly found near a login prompt. The user arrives at a page in which he is asked to enter his316
www.it-ebooks.infoCHAPTER 14 • AUTHENTICATING YOUR USERSe-mail address. Upon entering the address and submitting the form, a script similar to that shown inListing 14-10 is executed.Listing 14-10. A One-Time URL GeneratorWhen the user receives this e-mail and clicks the link, the script lostpassword.php, shown in Listing14-11, executes.Listing 14-11. Resetting a User’s Password
Page 2 and 3:
www.it-ebooks.info
Page 4 and 5:
www.it-ebooks.infoBeginning PHP and
Page 6 and 7:
• CONTENTS AT A GLANCEwww.it-eboo
Page 8 and 9:
• CONTENTSwww.it-ebooks.infoInsta
Page 10 and 11:
• CONTENTSwww.it-ebooks.infoNowdo
Page 12 and 13:
• CONTENTSwww.it-ebooks.infoCalcu
Page 14 and 15:
• CONTENTSwww.it-ebooks.infoDeter
Page 16 and 17:
• CONTENTSwww.it-ebooks.infoDispl
Page 18 and 19:
• CONTENTSwww.it-ebooks.infoServi
Page 21 and 22:
www.it-ebooks.info• CONTENTSSecur
Page 23 and 24:
www.it-ebooks.info• CONTENTSOther
Page 25 and 26:
www.it-ebooks.info• CONTENTSUser
Page 27 and 28:
www.it-ebooks.info• CONTENTSCreat
Page 29 and 30:
www.it-ebooks.info• CONTENTSOpeni
Page 31 and 32:
www.it-ebooks.infoAbout the Author
Page 33 and 34:
www.it-ebooks.info•Acknowledgment
Page 35 and 36:
www.it-ebooks.info• INTRODUCTIONC
Page 37 and 38:
www.it-ebooks.infoC H A P T E R 1
Page 39 and 40:
www.it-ebooks.infoCHAPTER 1 • INT
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
www.it-ebooks.infoCHAPTER 2 • CON
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
www.it-ebooks.infoCHAPTER 3 • PHP
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
www.it-ebooks.infoCHAPTER 4 • FUN
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
www.it-ebooks.infoCHAPTER 5 • ARR
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
www.it-ebooks.infoCHAPTER 6 • OBJ
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
www.it-ebooks.infoCHAPTER 7 • ADV
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
www.it-ebooks.infoCHAPTER 8 • ERR
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Page 225 and 226:
Page 227 and 228:
Page 229 and 230:
www.it-ebooks.infoCHAPTER 9 • STR
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
www.it-ebooks.infoCHAPTER 10 • WO
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289 and 290:
Page 291 and 292:
Page 293 and 294:
Page 295 and 296:
www.it-ebooks.infoCHAPTER 11 • PE
Page 297 and 298:
Page 299 and 300:
Page 301 and 302: www.it-ebooks.infoCHAPTER 11 • PE
Page 303 and 304: www.it-ebooks.infoCHAPTER 11 • PE
Page 305 and 306: www.it-ebooks.infoC H A P T E R 12
Page 307 and 308: www.it-ebooks.infoCHAPTER 12 • DA
Page 325 and 326: www.it-ebooks.infoCHAPTER 13• WOR
Page 341 and 342: www.it-ebooks.infoCHAPTER 14 • AU
Page 351: www.it-ebooks.infoCHAPTER 14 • AU
Page 357 and 358: www.it-ebooks.infoCHAPTER 15 • HA
Page 369 and 370: www.it-ebooks.infoCHAPTER 16 • NE
Page 389 and 390: www.it-ebooks.infoCHAPTER 17 • PH
Page 403 and 404:
Page 405 and 406:
www.it-ebooks.infoCHAPTER 18 • SE
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419 and 420:
Page 421 and 422:
Page 423 and 424:
Page 425 and 426:
www.it-ebooks.infoCHAPTER 19 • TE
Page 427 and 428:
Page 429 and 430:
Page 431 and 432:
Page 433 and 434:
Page 435 and 436:
Page 437 and 438:
Page 439 and 440:
Page 441 and 442:
Page 443 and 444:
Page 445 and 446:
Page 447 and 448:
Page 449 and 450:
www.it-ebooks.infoCHAPTER 20 • WE
Page 451 and 452:
Page 453 and 454:
Page 455 and 456:
Page 457 and 458:
Page 459 and 460:
Page 461 and 462:
Page 463 and 464:
Page 465 and 466:
Page 467 and 468:
Page 469 and 470:
Page 471 and 472:
Page 473 and 474:
Page 475 and 476:
www.it-ebooks.infoCHAPTER 22 • CR
Page 477 and 478:
Page 479 and 480:
Page 481 and 482:
Page 483 and 484:
Page 485 and 486:
Page 487 and 488:
www.it-ebooks.infoCHAPTER 23 • BU
Page 489 and 490:
Page 491 and 492:
Page 493 and 494:
Page 495 and 496:
www.it-ebooks.infoCHAPTER 24 • IN
Page 497 and 498:
Page 499 and 500:
Page 501 and 502:
Page 503 and 504:
Page 505 and 506:
Page 507 and 508:
Page 509 and 510:
Page 511 and 512:
Page 513 and 514:
Page 515 and 516:
Page 517 and 518:
Page 519 and 520:
Page 521 and 522:
Page 523 and 524:
Page 525 and 526:
Page 527 and 528:
Page 529 and 530:
Page 531 and 532:
Page 533 and 534:
Page 535 and 536:
Page 537 and 538:
Page 539 and 540:
Page 541 and 542:
Page 543 and 544:
www.it-ebooks.infoCHAPTER 27 • TH
Page 545 and 546:
Page 547 and 548:
Page 549 and 550:
Page 551 and 552:
Page 553 and 554:
Page 555 and 556:
Page 557 and 558:
Page 559 and 560:
Page 561 and 562:
Page 563 and 564:
Page 565 and 566:
www.it-ebooks.infoCHAPTER 28 • MY
Page 567 and 568:
Page 569 and 570:
Page 571 and 572:
Page 573 and 574:
Page 575 and 576:
Page 577 and 578:
Page 579 and 580:
Page 581 and 582:
Page 583 and 584:
Page 585 and 586:
Page 587 and 588:
Page 589 and 590:
Page 591 and 592:
Page 593 and 594:
Page 595 and 596:
Page 597 and 598:
Page 599 and 600:
Page 601 and 602:
Page 603 and 604:
Page 605 and 606:
Page 607 and 608:
Page 609 and 610:
Page 611 and 612:
Page 613 and 614:
Page 615 and 616:
Page 617 and 618:
Page 619 and 620:
Page 621 and 622:
Page 623 and 624:
Page 625 and 626:
www.it-ebooks.infoCHAPTER 30 • US
Page 627 and 628:
Page 629 and 630:
Page 631 and 632:
Page 633 and 634:
Page 635 and 636:
Page 637 and 638:
Page 639 and 640:
Page 641 and 642:
Page 643 and 644:
Page 645 and 646:
Page 647 and 648:
Page 649 and 650:
Page 651 and 652:
Page 653 and 654:
Page 655 and 656:
Page 657 and 658:
Page 659 and 660:
Page 661 and 662:
Page 663 and 664:
Page 665 and 666:
www.it-ebooks.infoCHAPTER 32 • ST
Page 667 and 668:
Page 669 and 670:
Page 671 and 672:
Page 673 and 674:
Page 675 and 676:
Page 677 and 678:
Page 679 and 680:
Page 681 and 682:
Page 683 and 684:
Page 685 and 686:
Page 687 and 688:
Page 689 and 690:
Page 691 and 692:
Page 693 and 694:
Page 695 and 696:
Page 697 and 698:
Page 699 and 700:
Page 701 and 702:
Page 703 and 704:
Page 705 and 706:
Page 707 and 708:
Page 709 and 710:
Page 711 and 712:
www.it-ebooks.infoCHAPTER 35 • PR
Page 713 and 714:
Page 715 and 716:
Page 717 and 718:
Page 719 and 720:
Page 721 and 722:
Page 723 and 724:
Page 725 and 726:
Page 727 and 728:
Page 729 and 730:
Page 731 and 732:
Page 733 and 734:
Page 735 and 736:
Page 737 and 738:
Page 739 and 740:
Page 741 and 742:
Page 743 and 744:
Page 745 and 746:
Page 747 and 748:
www.it-ebooks.infoCHAPTER 37 • TR
Page 749 and 750:
Page 751 and 752:
Page 753 and 754:
Page 755 and 756:
Page 757 and 758:
www.it-ebooks.infoCHAPTER 38 • IM
Page 759 and 760:
Page 761 and 762:
Page 763 and 764:
Page 765 and 766:
Page 767 and 768:
Page 769 and 770:
www.it-ebooks.infoIndex• Special
Page 771 and 772:
www.it-ebooks.info• INDEX-? optio
Page 773 and 774:
www.it-ebooks.info• INDEXASCII ra
Page 775 and 776:
www.it-ebooks.info• INDEXchanged
Page 777 and 778:
www.it-ebooks.info• INDEXsetting
Page 779 and 780:
www.it-ebooks.info• INDEXhiding,
Page 781 and 782:
www.it-ebooks.info• INDEXdelimiti
Page 783 and 784:
www.it-ebooks.info• INDEXencrypti
Page 785 and 786:
www.it-ebooks.info• INDEXreplacin
Page 787 and 788:
www.it-ebooks.info• INDEXFILTER_V
Page 789 and 790:
www.it-ebooks.info• INDEXgenerati
Page 791 and 792:
www.it-ebooks.info• INDEXIGNORE o
Page 793 and 794:
www.it-ebooks.info• INDEX• Kkey
Page 795 and 796:
www.it-ebooks.info• INDEXLOG_LOCA
Page 797 and 798:
www.it-ebooks.info• INDEXMVC (Mod
Page 799 and 800:
www.it-ebooks.info• INDEXmysqldum
Page 801 and 802:
www.it-ebooks.info• INDEXinterfac
Page 803 and 804:
www.it-ebooks.info• INDEXPDO::ATT
Page 805 and 806:
www.it-ebooks.info• INDEXstoring
Page 807 and 808:
www.it-ebooks.info• INDEXpublic,
Page 809 and 810:
www.it-ebooks.info• INDEXRoutine_
Page 811 and 812:
www.it-ebooks.info• INDEXtable-le
Page 813 and 814:
www.it-ebooks.info• INDEXSimplePi
Page 815 and 816:
www.it-ebooks.info• INDEXspecifyi
Page 817 and 818:
www.it-ebooks.info• INDEX• T\t
Page 819 and 820:
www.it-ebooks.info• INDEXunserial
Page 821 and 822:
www.it-ebooks.info• INDEXSHOW CRE
Page 823 and 824:
www.it-ebooks.info• INDEXZend_Con
Page 825:
www.it-ebooks.info
show all

PHP MySQL - Stilson.net

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

Delete template?

Save as template?