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PHP Math Exercises: Convert scientific notation to an int and a float

PHP math: Exercise-4 with Solution

Write a PHP script to convert scientific notation to an int and a float.

Sample scientific notation : 4.5e3

Sample Solution:

PHP Code:

<?php
$val = '4.5e3';
$ival = (int) $val;
$fval = (float) $val;
echo $ival."\n";
echo $fval."\n";
?>

Sample Output:

4                                                           
4500

Flowchart :

Flowchart: Convert scientific notation to an int and a float

PHP Code Editor:

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Previous: Write a PHP script to generate random 11 characters string of letters and numbers.
Next: Write a PHP script to convert a date from yyyy-mm-dd to dd-mm-yyyy.

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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