php lecture 8

this is lecture8 NT322 Lecture #9 # Wednesday November 8 / Friday November 11, 2011 # Basic PHP Language Syntax: // while loop: 12345678910 0123456789 12345678910 Current value of $v: 1 Current value of $v: 2 Current value of $v: 3 Current value of $v: 17 $a[0] is 2.3 0$a[1] is 98 1$a[2] is Hello World 2$a[3] is Seneca College 3$a[4] is 3.14 4$a[5] is 451 5 after math operations... $a[0] is 6.67 after math operations... $a[1] is 1862 after math operations... $a[2] is 0 after math operations... $a[3] is 0 after math operations... $a[4] is 9.8596 after math operations... $a[5] is 203401 i equals 2 $i is: 2 SERVER_NAME is: zenit.senecac.on.ca PHP_SELF is: /lecture.php REMOTE_ADDR is: 70.25.225.30 i is: 99 in the function $x is: YYY outside of the function...$x is: ABC Monday November 21 2011 EST10:39:22 PMportion is: 'sea shells by the seashore' string1 is: 'she sells sea shells by the seashore' strrev and strtoupper: 'EROHSAES EHT YB SLLEHS AES SLLES EHS'

this is lecture8 NT322 Lecture #9 # Wednesday November 8 / Friday November 11, 2011 # Basic PHP Language Syntax: // while loop: \n"; // do/while loop: $i = 0; do { print $i++; } while ($i< 10); echo " \n"; // for loop: for($i = 1; $i <= 10; $i++) { print $i; } echo " \n"; // foreach loops: $a = array(1, 2, 3, 17); // declaring arrays foreach($a as $v) { print "Current value of \$v: $v "; } echo " \n"; /* values and keys */ $a = array(2.3, 98, "Hello World", "Seneca College", 3.14, 451); $b = array(2.9, 19, "Hello World", "Seneca College", 3.14, 451); foreach($a as $k => $v) { print "\$a[$k] is $v \n"; } echo " \n"; foreach($a as $k => $v) { $a[$k] *= $b[$k]; print "after math operations... \$a[$k] is $a[$k] \n"; } echo " \n"; $i = 2; // switch/case: switch ($i) { case 0: print "i equals 0"; break; case 1: print "i equals 1"; break; case 2: print "i equals 2"; break; default: print "i is not equal to 0, 1 or 2"; } echo " \n"; // control structures: if($i == 0) { print "\$i is: $i \n"; } else if($i == 1) { print "\$i is: $i \n"; } else if($i == 2) { print "\$i is: $i \n"; } else if($i == 3) { print "\$i is: $i \n"; } else { print "\$i is > 3: $i \n"; } // predefined variables: $x = $_SERVER['SERVER_NAME']; print "SERVER_NAME is: $x \n"; // the name of the server host $x = $_SERVER['REQUEST_METHOD']; // 'GET', 'HEAD', 'POST' or 'PUT' $x = $_SERVER['PHP_SELF']; print "PHP_SELF is: $x \n"; // the filename of the currently executing script $x = $_SERVER['REMOTE_ADDR']; print "REMOTE_ADDR is: $x \n"; // the IP address from which the user is viewing the current page. $i = 99; ?> \n"; function display($myparam){ $x = $myparam; print "in the function \$x is: $x \n"; } display("YYY"); print "outside of the function...\$x is: $x \n"; // will output: "ABC" // DATE functions: echo date("l F d Y T"); // date( ) built-in PHP function. // l = day_of_week name // F = month name // d = 2-digit day of month // Y = 4 digit year // T = timezone echo date("h:i:s A"); // h = 2-digit hours // i = 2-digit minutes // s = 2-digit seconds // A = AM/PM // common variable functions /* empty - Determine whether a variable is set isset - same as !empty($a) gettype - Get the type of a variable get_defined_vars - Returns an array of all defined variables is_array - Finds whether a variable is an array is_bool - Finds out whether a variable is a boolean is_float - Finds whether a variable is a float is_int - Find whether a variable is an integer is_null - Finds whether a variable is NULL is_numeric - Finds whether a variable is a number or a numeric string is_object - Finds whether a variable is an object is_string - Finds whether a variable is a string unset - Unset a given variable functions for debugging : print_r - Prints human-readable information about a variable var_dump - Dumps information about a variable */ // common string functions: /* chop - Strip whitespace from the end of a string chr - Return a specific character crypt - DES-encrypt a string htmlspecialchars - Convert special characters to HTML entities md5 - Calculate the md5 hash of a string nl2br - Inserts HTML line breaks before all newlines in a string ord - Return ASCII value of character sprintf - Return a formatted string strip_tags - Strip HTML and PHP tags from a string addslashes - Quote string with slashes stripslashes - Un-quote string quoted with addslashes() strlen - Get string length strpos - Find position of first occurrence of a string strrev - Reverse a string strtolower - Make a string lowercase strtoupper - Make a string uppercase str_replace - Replace all occurrences of the search string with the replacement string join - Join array elements with a string split - split string into array by regular expression */ $string1 = "she sells sea shells by the seashore"; $portion = substr($string1, 10); echo "portion is: '$portion' \n"; echo "string1 is: '$string1' \n"; echo "strrev and strtoupper: '" . strrev(strtoupper($string1)) . "' \n"; // common array functions: /* count - Count elements in an array/object array_pop - Pop the element off the end of array array_push - Push one or more elements onto the end of array array_reverse - Return an array with elements in reverse order array_shift - Shift an element off the beginning of array array_unshift - Prepend one or more elements to the beginning of array array_sum - Calculate the sum of values in an array. array_unique - Removes duplicate values from an array array_values - Return all the values of an array in_array - Return TRUE if a value exists in an array array_search - Searches the array for a given value and returns the corresponding key if successful sizeof - Get the number of elements in an array/object sort - Sort an array uksort - Sort an array by keys using a user-defined comparison function usort - Sort an array by values using a user-defined comparison function */ ?>