ob_start turns on output buffering,
Related Posts:
How to prevent hijacking in PHP?
Make Error_reporting to E_ALL so that all variables will be intialized before using them. Make practice of using htmlentities(), strip_tags(), utf8_decode() and addslashes() for filtering malicious data in php&nb… Read More- You want to extract part of a string, starting at a particular place in the string
Use substr( ) to select your
substrings:
$substring = substr($string,$start,$length);
$username = substr($_REQUEST['username'],0,8);
… Read More
- how eliminate an object?
Objects are automatically destroyed when a script terminates.
To force the destruction of an
object, use unset( ):
$car = new car; // buy new car
...
unset($car); // car wreck
… Read More
- How to check whether two floating-point numbers are equal?
Use a small delta value, and check if the numbers are equal
within that delta:
$delta = 0.00001;
$a = 1.00000001;
$b = 1.00000000;
if (abs($a - $b) < $delta) { /* $a and $b are equal */ }
… Read More
- exchange the values in two variables without using additional variables for storage?
To swap $a and $b:
list($a,$b) = array($b,$a);
… Read More
- What are the differences between mysql_fetch_array(), mysql_fetch_object(), mysql_fetch_row()?
mysql_fetch_array() -> Fetch a result row as a combination of
associative array and regular array.
mysql_fetch_object() -> Fetch a result row as an object.
mysql_fetch_row() -> Fetch a result set as a regular array… Read More
- want to link two objects, so when you update one, you also update the other?
Use =& to assign one object to another by
reference:
$adam = new user;
$dave =& $adam;
… Read More
- how associate multiple elements with a single key?
Store the multiple elements in an array:
$fruits = array('red' => array('strawberry','apple'),
'yellow' => array('banana'));
Or, use an object:
while ($obj = mysql_fetch_object($r)) {
$fruits[ ] =… Read More
- Control Structures
if
else
elseif/else if
Alternative syntax for control structures
while
do-while
for
foreach
break
continue
switch
declare
return
require
include
require_ once
include_ once
goto
… Read More
- magic_quotes_gpc, magic_quotes_runtime
Magic quotes is the name of a PHP feature that automatically quotes inputdata, by using the addslashes() function. Historically, this was used so thatform data could be used directly in SQL queries without any security or qu… Read More
- Php get_meta_tags-Extracts all meta tag content attributes
get_meta_tags — Extracts all meta tag content attributes from a file and returns an array
<?php// Assuming the above tags are at www.example.com$tags = get_meta_tags('htt… Read More
- access the values passed to a function?how
Use the names from the function
prototype:
function commercial_sponsorship($letter, $number) {
print "This episode of Sesame Street is brought to you by ";
print "the letter $letter and number $number.\n";
}
com… Read More
- how create a new instance of an object?
Define the class, then use new
to create an instance of the class:
class user {
function load_info($username) {
// load profile from database
}
}
$user = new user;
$user->load_info($_REQUEST['username'… Read More
- PHP Redirect - Redirect Script?
PHP Redirect Function
header('Location: destination.php');
exit();
ou need the Location: part so the browser knows what header it's
receiving. Also, don't forget to
do an exit() or die() right after… Read More
- What is triggers?
A trigger is a database object which is associated with particular
database table.
Triggers gets called automatically when particular
event(INSERT, UPDATE, DELETE)
occurs on table.
… Read More