Download e-book for iPad: PHP Programming Solutions by Vikram Vaswani

By Vikram Vaswani

ISBN-10: 007148745X

ISBN-13: 9780071487450

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Extra info for PHP Programming Solutions

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Frank growls at Michael. > TIP You can perform multiple search-replace operations at once with str_replace(), by using arrays for both the search and replacement strings. 19 Extracting Substrings Problem You want to extract the substring preceding or following a particular match. php // define string $html = "Just when you begin to think the wagon of ↵ Vietnam-grounded movies is grinding to a slow halt, ↵ you're hit squarely in the face with another ↵ one.

Comments The previous listing uses two user-defined functions: encryptString() and decryptString(). Internally, both use functions provided by PHP’s ext/mcrypt extension, which supports a wide variety of encryption algorithms (Blowfish, DES, TripleDES, IDEA, Rijndael, Serpent, and others) and cipher modes (CBC, CFB, OFB, and ECB). Both functions accept a string and a key, and use the latter to encrypt or decrypt the former. The encryptString() function begins by seeding the random number generator and then generating an initialization vector (IV) with the mcrypt_create_iv() function.

Php // define cleartext string $password = "guessme"; Chapter 1: Working with Strings // define salt $salt = "rosebud"; // encrypt string $cipher = crypt($password, $salt); // assume the user inputs this $input = "randomguess"; // encrypt the input // test it against the encrypted password // result: "Passwords don't match" echo ($cipher == crypt($input, $salt)) ? ↵ "Passwords match" : "Passwords don't match"; // now assume the user inputs this $input = "guessme"; // encrypt the input // test it against the encrypted password // result: "Passwords match" echo ($cipher == crypt($input, $salt)) ?

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PHP Programming Solutions by Vikram Vaswani

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