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PHP Math Exercises: Find earliest and latest dates from a list of dates

PHP math: Exercise-7 with Solution

Find earliest and latest dates from a list of dates.

Pictorial Presentation:

PHP Math Exercises: Find earliest and latest dates from a list of dates

Sample Solution:

PHP Code:

<?php
$dates = array('2015-02-01', '2015-02-02', '2015-02-03');
echo "Latest Date: ". max($dates)."\n";
echo "Earliest Date: ". min($dates)."\n";
?>

Sample Output:

Latest Date: 2015-02-03                                     
Earliest Date: 2015-02-01

Flowchart :

Flowchart: Find earliest and latest dates from a list of dates

PHP Code Editor:

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Previous: Write a PHP script to get the information regarding memory usage in KB or MB etc.
Next: Write a PHP function to round a float away from zero to a specified number of decimal places.

What is the difficulty level of this exercise?



PHP: Tips of the Day

SQL injection that gets around mysql_real_escape_string()

Consider the following query:

$iId = mysql_real_escape_string("1 OR 1=1");    
$sSql = "SELECT * FROM table WHERE id = $iId";

mysql_real_escape_string() will not protect you against this. The fact that you use single quotes (' ') around your variables inside your query is what protects you against this. The following is also an option:

$iId = (int)"1 OR 1=1";
$sSql = "SELECT * FROM table WHERE id = $iId";

Ref : https://bit.ly/32q3bJ7