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PHP function Exercises: Sort an array

PHP function: Exercise-4 with Solution

Write a function to sort an array.

Pictorial Presentation:

PHP function Exercises: Sort an array

Sample Salution:

PHP Code:

<?php
function array_sort($a)
{
 for($x=0;$x< count($a);++$x)
  {
    $min = $x;
  for($y=$x+1;$y< count($a);++$y)
   {
	 if($a[$y] < $a[$min] ) 
	 {
	   $temp = $a[$min];
	   $a[$min] = $a[$y];
	   $a[$y] = $temp;
	 }
	}
  }
 return $a;
 }
$a = array(51,14,1,21,'hj');
print_r(array_sort($a));
?>

Sample Output:

Array                                                       
(                                                           
    [0] => hj                                               
    [1] => 1                                                
    [2] => 14                                               
    [3] => 21                                               
    [4] => 51                                               
) 

Flowchart :

Flowchart: Sort an array

PHP Code Editor:

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Next: Write a PHP function that checks if a string is all lower case.

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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