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PHP Math Exercises: Get random float numbers

PHP math: Exercise-10 with Solution

Write a PHP function to get random float numbers.

Pictorial Presentation:

PHP Math Exercises: Get random float numbers

Sample Solution:

PHP Code:

<?php
function rand_float($st_num=0,$end_num=1,$mul=1000000)
{
if ($st_num>$end_num) return false;
return mt_rand($st_num*$mul,$end_num*$mul)/$mul;
}
echo rand_float()."\n";
echo rand_float(0.6)."\n";
echo rand_float(0.5,0.6)."\n";
echo rand_float(0,20)."\n";
echo rand_float(0,3,2)."\n"; 
echo rand_float(0,2,20)."\n";
?>

Sample Output:

0.613314                                                    
0.886207                                                    
0.57955                                                     
17.570268                                                   
1.5                                                         
1.6

Flowchart :

Flowchart: Get random float numbers

PHP Code Editor:

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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