It checks whether the date is valid or not
General Format :checkdate ( int $month , int $day , int $year )
Example :
<?php
if(checkdate(12, 31, 2000))
echo “Given Date Is Correct”;
?>
Output
Given Date Is Correct
Category Archives: PHP
Date functions
- checkdate – It checks whether the date is valid or not
- date_add – Its an alias of DateTime::add()
- date_create_from_format – Its an alias of DateTime::createFromFormat()
- date_create – Its an alias of DateTime::__construct() and creates new DateTime object
- date_date_set – Its an alias of DateTime::setDate() and sets the date.
- date_default_timezone_get – Gets the default timezone used
- date_default_timezone_set – It can be used to set the time zone
- date_diff – It is an alias of DateTime::diff()
- date_format – It is an alias of DateTime::format()
- date_get_last_errors – It is an alias of DateTime::getLastErrors()
- date_interval_create_from_date_string – Alias of DateInterval::createFromDateString()
- date_interval_format – It is an Alias of DateInterval::format()
- date_isodate_set – It is an alias of DateTime::setISODate()
- date_modify – It an alias of DateTime::modify()
- date_offset_get – its an alias of DateTime::getOffset()
- date_parse_from_format – It returns details about given date
- date_parse – It returns associative array with detailed info about given date
- date_sub – Its an alias of DateTime::sub()
- date_sun_info – It Returns information about sunset/sunrise and twilight begin/end
- date_sunrise – It returns time of sunrise for a given day and location
- date_sunset – It returns time of sunset for a given day and location
- date_time_set – Its an alias of DateTime::setTime() and it sets the time
- date_timestamp_get – Its an alias of DateTime::getTimestamp()
- date_timestamp_set– Its an alias of DateTime::setTimestamp()
- date_timezone_get – Its an alias of DateTime::getTimezone()
- date_timezone_set – Its an alias of DateTime::setTimezone()
- date – It can be used to format the date/time of the server .
- getdate – It returns date/time details
- gettimeofday – It returns the current time.
- gmdate – Its similar to datefunction but formats GMT
- gmmktime – It returns Unix timestamp for a GMT date
- gmstrftime – it formats a GMT/UTC time/date according to locale settings
- idate – It formats a local time/date as integer
- localtime – It returns the local time
- microtime – It return current Unix timestamp with microseconds
- mktime – It returns Unix timestamp for a date
- strftime – It formats a local time/date according to locale settings
- strptime – it parses time/date generated with strftime()
- strtotime – it converts date/time into a Unix timestamp
- time – It returns current Unix timestamp
- timezone_abbreviations_list – Its an alias of DateTimeZone::listAbbreviations()
- timezone_identifiers_list – Its an alias of DateTimeZone::listIdentifiers()
- timezone_location_get – Its an alias of DateTimeZone::getLocation()
- timezone_name_from_abbr – It Returns the timezone name from abbreviation
- timezone_name_get – Its an alias of DateTimeZone::getName()
- timezone_offset_get – Its an alias of DateTimeZone::getOffset()
- timezone_open – Its an alias of DateTimeZone::__construct()
- timezone_transitions_get – Its an alias of DateTimeZone::getTransitions()
- timezone_version_get – It returns the version of the timezonedb
Generate Random Number
<?php echo rand(1, 10) ?>
Find the position of a character in a string
We can find out the position using the function strpos() that will return the position of a character
Example
<?php
$string=”phpcodez.com”;
echo strpos($string,”.”) // 8
?>
register_long_arrays
Its a flag and if its value is set to one we must use the longer version of the variable
| Array Name | Longer version of the name |
| $_POST | $HTTP_POST_VARS |
| $_FILES | $HTTP_POST_FILES |
| $_GET | $HTTP_GET_VARS |
| $_COOKIE | $HTTP_COOKIE_VARS |
| $_ENV | $HTTP_ENV_VARS |
| $_SERVER | $HTTP_SERVER_VARS |
| $_SESSION | $HTTP_SESSION_VARS |
Its not at all a convenient option , so its always better to have the value set to off
Unicode
Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world’s writing systems. Developed in conjunction with the Universal Character Set standard and published in book form as The Unicode Standard, the latest version of Unicode consists of a repertoire of more than 109,000 characters covering 93 scripts, a set of code charts for visual reference, an encoding methodology and set of standard character encodings, an enumeration of character properties such as upper and lower case, a set of reference data computer files, and a number of related items, such as character properties, rules for normalization, decomposition, collation, rendering, and bidirectional display order
Unicode can be implemented by different character encodings. The most commonly used encodings are UTF-8, the now-obsolete UCS-2, and UTF-16. UTF-8 uses one byte for any ASCII characters, which have the same code values in both UTF-8 and ASCII encoding, and up to four bytes for other characters. UCS-2 uses two bytes for each character but cannot encode every character in the current Unicode standard. UTF-16 extends UCS-2, using four bytes to handle each of the additional characters.
php6 features
- Unicode
- Alternative PHP Cache
- Namespaces
- late static binding
- mysqlnd
- breaking to a label
- foreach on multidimensional arrays
- improvements to []
Namespaces
Namespaces is a method with which we can group variable,function or objects so that we can have more than one variable or function or object with same name .
Namespaces were introduced into PHP from version 5.3 onwards
Example
<?php
namespace php;
class php
{
public function phpcodez()
{
echo ‘Function1 <br />’;
}
}
namespace codez;
class codez
{
public function phpcodez()
{
echo ‘Function2 <br />’;
}
}
$phpcodez = new phpphp();
$phpcodez->phpcodez();
$phpcodez = new codezcodez();
$phpcodez->phpcodez();
?>
Check magic quotes off – PHP
<?php echo get_magic_quotes_gpc()?”Enabled”:”Disabled”; ?>
Function
A function is a group of statements that will do certain tasks.
Why Function
When we develop a module in a project , we may need to implement certain tasks(block of statements ) more than once . Writing same block of codes more than once is not at all a good practice . Instead we can give a name to that block and can use them whenever necessary . When we define a block with a name , it is known as function .
General Format
function funation_name(){
echo “Error”; // can be on or more lines of statements
}
function – a keyword
funation_name – Any desired name(Should be meaningful)
Once the function is desfined , You can can invoke it by calling its name
<?php funation_name(); ?> // It will print the text “ Error”
A function can have arguments . When a fuction is define using arguments in it , we should pass the values when calling the it .
Example :
function function_sum($a,$b){
echo $a+$b;
}
<?php function_sum(7,8); ?> // It will display 15 as the result .
Note : We should not use any Builtin function name as the function name
Pramod T P 