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PHP Math Exercises: Find the maximum and minimum marks from the set of arrays

PHP math: Exercise-1 with Solution

Write a PHP script to find the maximum and minimum marks from the following set of arrays.

Sample arrays :
$marks1 = array(360,310,310,330,313,375,456,111,256);
$marks2 = array(350,340,356,330,321);
$marks3 = array(630,340,570,635,434,255,298);

Pictorial Presentation:

PHP Math Exercises: Find the maximum and minimum marks from the  set of arrays

Sample Solution:

PHP Code:

<?php
$marks1 = array(360,310,310,330,313,375,456,111,256); 
$marks2 = array(350,340,356,330,321); 
$marks3 = array(630,340,570,635,434,255,298); 
$max_marks = max(max($marks1),max($marks2),max($marks3)); 
$min_marks = min(min($marks1),min($marks2),min($marks3)); 
echo "Maximum marks : ".$max_marks."\n";
echo "Minimum marks : ".$min_marks."\n";
?>

Sample Output:

Maximum marks : 635                                         
Minimum marks : 111

Flowchart:

Flowchart: Find the maximum and minimum marks from the  set of arrays

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