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PHP Math Exercises: Generate random 11 characters string of letters and numbers

PHP math: Exercise-3 with Solution

Write a PHP script to generate random 11 characters string of letters and numbers.

Pictorial Presentation:

PHP Math Exercises: Generate random 11 characters string of letters and numbers

Sample Solution:

PHP Code:

<?php
$x = rand(10e12, 10e16);
echo base_convert($x, 10, 36)."\n";
?>

Sample Output:

3b6jfwh18v2

Flowchart:

Flowchart: Generate random 11 characters string of letters and numbers

PHP Code Editor:

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Previous: Write a PHP script which rounds the specified values with 1 decimal digit precision.
Next: Write a PHP script to convert scientific notation to an int and a float.

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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