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PHP Class Exercises : Convert a string to Date and DateTime

PHP class: Exercise-7 with Solution

Write a PHP script to a convert string to Date and DateTime.

Sample Date : '12-08-2004'
Note : PHP considers '/' to mean m/d/Y format and '-' to mean d-m-Y format.

Sample Solution:

PHP Code:

<?php
$dt = DateTime::createFromFormat('m-d-Y', '12-08-2004')->format('Y-m-d');
echo $dt;
?>

Sample Output:

2004-12-08

Flowchart :

Flowchart: Convert a string to Date and DateTime

PHP Code Editor:

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PHP: Tips of the Day

PHP represents "no value" with the null keyword. It's somewhat similar to the null pointer in C-language and to the NULL value in SQL.

Setting the variable to null:

Example:

$nullvar = null; // directly
function doSomething() {} // this function does not return anything
$nullvar = doSomething(); // so the null is assigned to $nullvar

Checking if the variable was set to null:

if (is_null($nullvar)) { /* variable is null */ }
if ($nullvar === null) { /* variable is null */ }

Null vs undefined variable

If the variable was not defined or was unset then any tests against the null will be successful but they will also generate a Notice: Undefined variable: nullvar:

$nullvar = null;
unset($nullvar);
if ($nullvar === null) { /* true but also a Notice is printed */ }
if (is_null($nullvar)) { /* true but also a Notice is printed */ }

Therefore undefined values must be checked with isset:

if (!isset($nullvar)) { /* variable is null or is not even defined */ }