What is PHP? What is PHP? Quick in addition to Dirty Intro so that PHP

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What is PHP? What is PHP? Quick in addition to Dirty Intro so that PHP

Campbell University, US has reference to this Academic Journal, Quick in addition to Dirty Intro so that PHP By David Choffnes (content shamelessly ripped from the manual) What is PHP? PHP (recursive acronym in consideration of “PHP: Hypertext Preprocessor”) is a widely-used Open Source general-purpose scripting language that is especially suited in consideration of Web development in addition to can be embedded into HTML. Write an HTML script alongside some embedded code so that do something Code is executed on the server. What is PHP? An example: Example 1-1. An introductory example

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Ridiculous DB support (and more) Writing a database-enabled web page is incredibly simple. The following databases are currentlysupported: Adabas D, Ingres, Oracle (OCI7 in addition to OCI8), dBase, InterBase, Ovrimos, Empress, FrontBase, PostgreSQL, FilePro (read-only), mSQL, Solid Hyperwave, Direct MS-SQL, Sybase, IBM DB2, MySQL, Velocis, Informix, ODBC, Unix dbm DBX database abstraction extension allows you so that transparently use any database Supports ODBC, the Open Database Connection standard, Support in consideration of talking so that other services using protocols such as LDAP, IMAP, SNMP, NNTP, POP3, HTTP, COM (on Windows) in addition to countless others. Basic syntax Escaping from HTML Example 5-1. Ways of escaping from HTML 1. This is a shortcut in consideration of “” 2. 3. 4. Basic Syntax Example 5-2. Advanced escaping This is true. This is false.

Instruction Separation Instructions are separated the same as in C or Perl – terminate each statement alongside a semicolon. The closing tag (?>) also implies the end of the statement, so the following are equivalent: Comments PHP supports C, C++ in addition to Unix shell style comments Types PHP supports eight primitive types. Four scalar types: boolean integer floating-point number (float) string Two compound types: array object And finally two special types: resource NULL

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Scalars Very simple: $foo = true; (boolean) $foo = 20; (integer) $foo = 3.1415; (float) Strings A string literal can be specified in three different ways. single quoted Variables not expanded double quoted $foo = 20; echo ?The value of foo is $foo?; Strings heredoc syntax Example 6-2. Here doc string quoting example << Arrays Specifying alongside array() An array can be created by the array() language-construct. It takes a certain number of comma-separated key => value pairs. A key is either a nonnegative integer or a string. If a key is the standard representation of a non-negative integer, it will be interpreted as such (i.e. ?8? will be interpreted as 8, while ?08? will be interpreted as ?08?). A value can be anything. If you omit a key, the maximum of the integer-indices is taken, in addition to the new key will be that maximum +1. If no integer-indices exist yet, the key will be 0 (zero). If you specify a key that already has a value assigned so that it, that value will be overwritten. Arrays array( [key =>] value , . ) // key is either string or nonnegative integer // value can be anything Creating/modifying alongside square-bracket syntax You can also modify an existing array, by explicitly setting values. This is done by assigning values so that the array while specifying the key in brackets. You can also omit the key, add an empty pair of brackets (“[]”) so that the variable-name in that case. Arrays $arr[key] = value; $arr[] = value; // key is either string or nonnegative integer // value can be anything

Objects Object Initialization To initialize an object, you use the new statement so that instantiate the object so that a variable. do_foo(); ?> Null The special NULL value represents that a variable has no value. NULL is the only possible value of type NULL. Type Juggling PHP does not require (or support) explicit type definition in variable declaration; A variable?s type is determined by the context in which that variable is used. If you assign a string value so that variable var, var becomes a string. If you then assign an integer value so that var, it becomes an integer. Operators on multiple types do NOT change the types of the operands themselves; the only change is in how the operands are evaluated.

Type Juggling Example $foo = “0”; // $foo is string (ASCII 48) $foo += 2; // $foo is now an integer (2) $foo = $foo + 1.3; // $foo is now a float (3.3) $foo = 5 + “10 Little Piggies”; // $foo is integer (15) $foo = 5 + “10 Small Pigs”; // $foo is integer (15) Variable Basics Variables in PHP are represented by a dollar sign followed by the name of the variable. Variable name is case-sensitive. Variable names follow the same rules as other labels in PHP. A valid variable name starts alongside a letter or underscore Followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: ?[a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*? Variables Example $var = “Bob”; $Var = “Joe”; echo “$var, $Var”; // outputs “Bob, Joe” $4site = ?not yet?; // invalid; starts alongside a number $_4site = ?not yet?; // valid; starts alongside an underscore $t„yte = ?mansikka?; // valid; ?„? is ASCII 228.

References Example PHP Variables $argv Array of arguments passed so that the script. $argc Contains the number of command line parameters passed so that the script (if run on the command line). $PHP_SELF The filename of the currently executing script, relative so that the document root. $HTTP_COOKIE_VARS An associative array of variables passed so that the current script via HTTP cookies. $_COOKIE An associative array of variables passed so that the current script via HTTP cookies. $HTTP_GET_VARS An associative array of variables passed so that the current script via the HTTP GET method. PHP Variables $_GET An associative array of variables passed so that the current script via the HTTP GET method. $HTTP_POST_VARS An associative array of variables passed so that the current script via the HTTP POST method. $_POST An associative array of variables passed so that the current script via the HTTP POST method. $HTTP_POST_FILES An associative array of variables containing information about files uploaded via the HTTP POST method. $_FILES An associative array of variables containing information about files uploaded via the HTTP POST method

PHP Variables $HTTP_ENV_VARS An associative array of variables passed so that the current script via the parent environment. $_ENV An associative array of variables passed so that the current script via the parent environment. $HTTP_SERVER_VARS An associative array of variables passed so that the current script from the HTTP server. $_SERVER An associative array of variables passed so that the current script from the HTTP server. PHP Variables $HTTP_SESSION_VARS An associative array of session variables passed so that the current script. $_SESSION An associative array of session variables passed so that the current script. $_REQUEST An associative array merged from the GET, POST, in addition to Cookie variables. In other words – all the information that is coming from the user, in addition to that from a security point of view, cannot be trusted. Scope Variables declared outside of functions, classes are global so that the script, outside of function blocks Unlike C! Global variables are not automatically available so that functions Example: $a = 1; /* global scope */ function Test() { echo $a; /* reference so that local scope variable */ } Test();

Variable Scope Access so that global variables inside functions Explicitly declare variable as global global $a, $b; Use the $GLOBALS array $foo = $GLOBALS[?a?] Variable Variables (aka, Dave blows your mind) A variable variable takes the value of a variable in addition to treats that as the name of a variable. In the above $a = “hello”; $$a = “world”; Two variables have been defined in addition to stored in the PHP symbol tree: $a alongside contents “hello” $hello alongside contents “world? echo “$a ${$a}”; produces the exact same output as: echo “$a $hello”; i.e. they both produce: hello world. HTML Forms (GET in addition to POST) When a form is submitted so that a PHP script, any variables from that form will be automatically made available so that the script by PHP. Located in the associative arrays $HTTP_POST_VARS, $HTTP_GET_VARS, and/or $HTTP_POST_FILES, according so that the source of the variable in question. Example 7-1. Simple form variable Name:

Oracle Function List OCILoadLob OCIColumnScale OCIColumnPrecision OCIColumnTypeRaw OCINewCollection OCIFreeCollection OCICollAssign OCICollAppend OCICollAssignElem OCICollGetElem OCICollMax

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This Particular Journal got reviewed and rated by PHP Variables $HTTP_ENV_VARS An associative array of variables passed so that the current script via the parent environment. $_ENV An associative array of variables passed so that the current script via the parent environment. $HTTP_SERVER_VARS An associative array of variables passed so that the current script from the HTTP server. $_SERVER An associative array of variables passed so that the current script from the HTTP server. PHP Variables $HTTP_SESSION_VARS An associative array of session variables passed so that the current script. $_SESSION An associative array of session variables passed so that the current script. $_REQUEST An associative array merged from the GET, POST, in addition to Cookie variables. In other words – all the information that is coming from the user, in addition to that from a security point of view, cannot be trusted. Scope Variables declared outside of functions, classes are global so that the script, outside of function blocks Unlike C! Global variables are not automatically available so that functions Example: $a = 1; /* global scope */ function Test() { echo $a; /* reference so that local scope variable */ } Test(); and short form of this particular Institution is US and gave this Journal an Excellent Rating.