Tài liệu PHP and MySQL by Example- P1 docx

... Why!was !PHP! developed,!what!it!is!used!for, !and! where!can!you!get!it?! 4. What!is !MySQL! used!for !and! where!can!you!get!it?! 5. What!are!the!benefits!of!using !PHP! and! MySQL? ! 6. Why!do !PHP! and! MySQL! work!well!together?! ... watermark.1.3.4. Advantages of MySQL and PHP Certain technologies play together better than others. PHP, a simple and powerful scripting language, and MySQL, a solid and reliable database server, ... uses PHP. We will learn how to create and execute simple PHP scripts both from the browser and at the command line. We will talk about built-in functions and how to use them by viewing the PHP...

... ! PHP provides additional metasymbols to represent a character class. The symbols \d and \D represent a single digit and a single nondigit, respectively (the same as [0-9] and [^0-9]); \w and ... occurrences; two numbers separated by a comma (e.g., {3,10}), represents an inclusive range; and a number followed by a comma (e.g., {4,}), represents a number of characters and any amount after that. ... number as [0-9], it can be represented as \d, and the alternative for representing a nonnumber [^0-9] is \D. Metasymbols are easier to use and and to type. Table 12.9. Metasymbols Symbol What+It+Matches...

... have successfully installed and configured PHP and MySQL. A.4.1. Where to Find the Files for the Canvas Gallery Site To install the PHP files on your computer, unzip and copy the entire art gallery ... project was to give you a chance to see the features of both PHP and MySQL working together as a team as described in Chapter 15, PHP and MySQL Integration.” Although there is much that could be ... Installing the MySQL Database Next, you need to install the database. To do this, log into MySQL using either the mysql. exe command prompt (as shown in Figure A.10) or a GUI such as the MySQL Query...

... fgets($filehandle); // Reads a character from file attached to $filehandle $char = fgetc($filehandle); // Reads chunk of bytes from file attached to $filehandle $text = fread($filehandle, $bytes ... a script and within functions. They are special variables provided by PHP to help you manage HTML forms, cookies, sessions, and files, and to get information about your environment and server. ... assume register_globals is set to “On.” How PHP Handles Form Input For each HTML form parameter, PHP creates a global variable by the same name and makes it available to your script. For example,...

... $x and $y and $z; echo "$x and $y and $z <em>yields</em> " . (int)$result .".\n<br />"; 4 $result = ($x and $y and $z); echo "($x and $y and ... About PHP Operators and Expressions Data objects can be manipulated in a number of ways by the large number of operators provided by PHP. Operators are symbols, such as +, -, =, >, and <, ... **Figure 5.14. The PHP script output from Example 5.11. ** The Difference Between &&/|| and the Words and/ or You can use the words and and or to replace && and ||, respectively,...

... Because PHP uses the ASCII collating sequence, an uppercase “A” is represented as decimal 65 and an uppercase “B” as decimal 66, and so on. On the other hand, a lowercase “a” is 97 and a lowercase ... delimiter and returns an array. The implode() function takes an array and joins the elements together to form a string. Because these functions require that you understand PHP arrays and regular ... a String PHP provides a number of functions to split strings. The split() and spliti() functions split up a string and return an array. The explode() function splits up a string by a specified...

... The!HTML!submit!input!type!is!given!a!name,!submit_fare,!that!will!be!used!in!the!following !PHP! script. 4 The!opening !PHP! tag!tells !PHP! to!start!processing. 5 Now!we!are!looking!at!the !PHP! instructions.!If!the!user!pressed!the!submit!button,!this!file!will!execute. !PHP! will!store!the!names!of!the!input!devices!in!variables,!$age !and! $submit_fare.!This!conditional!expression!tests!to!see!if!those!variables!were!set.!If!they!weren’t!set,!then!the!form!was!either!not!submitted!or!the!user!left!it!empty,!or!both. ... special significance and those characters are represented by HTML entities, special symbols starting with an ampersand and terminated with a semicolon; for example, the < and > symbols are ... In!the!switch!expression,!the!value!of!$color!is!matched!against!the!values!of!each!of!the!following!case!labels.! (PHP! names!the!variable,!$color, !by! the!same!name!assigned!to!the!radio!button !and! assigns!to!the!varia b le!the!value!that!was!selected !by! the! user!when!he!or!she!clicked!the!button.!If!the!user!clicked!red,!then!$color!will!evaluate!to!red.)!See!Figures!7.6 !and! 7.7....

... Modifying a Value by Reference with a foreach Loop As of PHP 5, you can easily modify an array’s elements by preceding the value after the as keyword with &. This will assign by reference instead ... this watermark.8.1.8. Extracting Keys and Values from Arrays PHP provides functions that allow you to extract elements from an array and assign the keys and values to variables. The array_keys() ... !Figure 8.19. Modifying values by reference. Output from Example 8.15. 8.1.5. Checking If an Array Exists PHP makes it possible to check to see if an array exists, and to check for the existence...

... Arrays !and! Strings explode() Splits!up!a!string !by! a!specified!delimiter !and! creates !and! array!of!strings!(see!page!276). implode() Glues!the!elements!of!an!array!together !by! some!delimiter !and! creates!a!string!(see!page!276). ... program. PHP starts executing the instructions in the function, and when finished, returns to the main program and picks up where it left off. Functions can be used over and over again and thus ... The!array_rand()!function!is!given!a!second!argument,!the!number!2,!which!is!the!number!of!random!items!to!return.!The!array!called!$selection!will!contain!another!array!of!two!random!key/index!values. 3 The!first !and! second!randomly!selected!strings!are!printed.!The!value!of!$selection[0]!is!a!random!index!number.!So!is!the!value!of!$selection[1]. !By! using!those!array!elements!as!indexes!for!the!$sayings!array,!a!randomized!string!will!be!returned.!Notice!the!curly!braces!surrounding!the!$sayings!array.!The!curly!braces!block!the!array!elements!so!that!the!first!$!applies!to!the!whole!array.!If!you!remove!the!curly!braces,!you!will!get!an!error.!The!other!way!to!print!this!would!be!to!remove!the!quotes:!!print...

... require('C:\pub\library\file .php& apos;) or include('/usr/htdocs/file .php& apos;). Just like require() and include(), the require_once() and include_once() statements, respectively, include and evaluate ... a good handle on functions, it is time to talk about how PHP and HTML work together when producing forms. In Chapter 10, “More on PHP Forms,” you will see a number of functions to handle incoming ... 10. More on PHP Forms 10.1. Introduction We discussed forms briefly in Chapter 3, PHP Quick Start,” and now we are ready to delve into a more thorough discussion about how PHP handles form...