TRAIT_EXISTS(3) 1 TRAIT_EXISTS(3)trait_exists - Checks if the trait existsSYNOPSIS
bool trait_exists (string $traitname, [bool $autoload])
DESCRIPTION PARAMETERS
o $traitname
- Name of the trait to check
o $autoload
- Whether to autoload if not already loaded.
RETURN VALUES
Returns TRUE if trait exists, FALSE if not, NULL in case of an error.
PHP Documentation Group TRAIT_EXISTS(3)
Check Out this Related Man Page
CLASS_EXISTS(3) 1 CLASS_EXISTS(3)class_exists - Checks if the class has been definedSYNOPSIS
bool class_exists (string $class_name, [bool $autoload = true])
DESCRIPTION
This function checks whether or not the given class has been defined.
PARAMETERS
o $class_name
- The class name. The name is matched in a case-insensitive manner.
o $autoload
- Whether or not to call __autoload by default.
RETURN VALUES
Returns TRUE if $class_name is a defined class, FALSE otherwise.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.0.2 | |
| | |
| | No longer returns TRUE for defined interfaces. |
| | Use interface_exists(3). |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
class_exists(3) example
<?php
// Check that the class exists before trying to use it
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
?>
Example #2
$autoload parameter example
<?php
function __autoload($class)
{
include($class . '.php');
// Check to see whether the include declared the class
if (!class_exists($class, false)) {
trigger_error("Unable to load class: $class", E_USER_WARNING);
}
}
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
?>
SEE ALSO function_exists(3), interface_exists(3), get_declared_classes(3).
PHP Documentation Group CLASS_EXISTS(3)
Emergency UNIX and Linux Support !! Help Me! Forum (Request Urgent Help)
README FIRST: How to Request Emergency or Urgent Help:
You may post emergency work-related questions in the emergency forum. To post in this forum you will need to use your Bits. All questions answered on a "best... (0 Replies)
Homework Help:
On Posting Questions:
Any and all high school and undergraduate homework assignments or textbook style exercises for which you are seeking assistance are to be posted only in our Homework & Coursework Questions area--not in blogs, visitor messages, PMs, or the main technical... (0 Replies)
How to Use Code Tags in The UNIX and Linux Forums
Developer: This video tutorial was created by scott for forum users. Everyone should use code tags when posting code and command line logic in the forums.
cPF45jjWe7Q
A full list of BB codes is available here. (8 Replies)
RULES OF THE UNIX AND LINUX FORUMS
For the latest version of the community rules (the official community rules page), please visit here.
No flames, shouting (all caps), sarcasm, bullying, profanity or arrogant posts.
No negative comments about others or impolite remarks. Be patient. No... (1 Reply)
Hey,
Just added a new UserCP option so you can change the code tags to look like the code tags in this example (turn this on and off):
Note: I set the default to "SyntaxHighlighting" for debugging purposes. We can change the default back to the original code tags later.
... (36 Replies)
Having spent a lot of time over the past year taking a legacy vBulletin site (this forum) and making the site responsive on mobile; I've happy with the results; but it will soon be time to move on.
Basically, at our core, we are a LAMP (Linux, Apache2, MySQL and PHP) site, and vBulletin was... (6 Replies)
On this special Happy News Year day, 1 January 2019, I am pleased to promote Ravinder Singh to UNIX.COM Moderator, for at least the following reasons:
Ravinder Loves UNIX.COM
Ravinder has 1,372 Thanks, which puts him in the Top Ten in that important single category.
Ravinder is one of... (8 Replies)
Please join me in congratulations to Wolf Machowitsch (bakunin) for his long overdue lifetime achievement award badge from UNIX.COM in computer wizardry:
"The Order of the Wizard's Hat - Lifetime Achievement Award"
This "Order of the Wizard's Hat" is presented to Wolf Machowitsch (bakunin)... (11 Replies)
Dear All,
We were hit with a denial of service (DOS) attack today beginning around June 12th 2019 @ 01:27:51 PM from an IP address registered to "RACKWEB-NET" in Bulgaria.
I was notified about this around June 12th 2019 @ 03:05 PM and did some log file analysis and discovered how the attack... (4 Replies)
Dear All,
I am very pleased to inform everyone that Nicki Paul (zxmaus) is joining the Moderation Team after a number of years away from the site.
Nicki used to be very active here (over 800 posts), and she got busy with travel, work, family and her dogs, and we have missed her. Now she is... (7 Replies)