PHP: Clean-up Web Form Data

PHP

function clean_input($a){

    $data=trim($a);

    $data=stripslashes($a);

    $data=htmlspecialchars($a);

    

    return $data;

}

if($_SERVER['REQUEST_METHOD'] == 'POST'){

    $name=clean_input($_POST['name']);

    $phone=clean_input($_POST['phone']);

    $email=clean_input($_POST['email']);

    $comments=clean_input($_POST['comments']);

    

}

PHP: Determining if substring is in position zero.

PHP

$var="Duis posuere nunc sit amet sapien pharetra, at scelerisque risus fringilla. Aenean sed purus nec quam ullamcorper aliquam.";




function sub1($var,$sub){
   if(strpos($var,$sub) === 0){ // use identity operator because false is also equal to 0
     echo "<p>".str_pad($sub,25,".").str_pad(" is in position zero",25,".",STR_PAD_LEFT)."</p>";
   }
   else{
     echo "<p>".str_pad($sub,25,".").str_pad(" is not in position zero",25,".",STR_PAD_LEFT)."</p>";
   }
}




sub1($var,'scelerisque');

sub1($var,'Duis');

//Result

scelerisque............... is not in position zero

Duis.......................... is in position zero

PHP: Fun with string functions

PHP

$var="Duis posuere nunc sit amet sapien pharetra, at scelerisque risus fringilla. Aenean sed purus nec quam ullamcorper aliquam.";

printf("%s %s","String equals:",$var);

echo "<pre>"; 

echo "<p><b>Substring: substr(\$var,12,9): ' nunc sit'</b></p>";

echo "<p>".substr($var,12,9)."</p>";

echo "<p><b>Substring and Subpoition: substr(\$var,27,6).' => '.strpos(\$var,'sapien'): sapien => 27</b></p>";

echo "<p>".substr($var,27,6)." => ".strpos($var,"sapien")."</p>";

echo "</pre>";

echo "<p><b>explode string and list</b></p>";

$arr=explode(" ",$var);

foreach($arr as $val){

  echo "<p>".$val."</p>";

}  

echo "<p><b>explode string to array and implode back to string (just because)</b></p>";

echo "<pre>";

echo "<p>".implode(" ",explode(" ",$var))."</p>";

echo "</pre>";

  

//Result

String equals: Duis posuere nunc sit amet sapien pharetra, at scelerisque risus fringilla. Aenean sed purus nec quam ullamcorper aliquam.

Substring: substr($var,12,9): ' nunc sit'

nunc sit

Substring and Subpoition: substr($var,27,6).' => '.strpos($var,'sapien'): sapien => 27

sapien => 27

explode string and list

Duis

posuere

nunc

sit

amet

sapien

pharetra,

at

scelerisque

risus

fringilla.

Aenean

sed

purus

nec

quam

ullamcorper

aliquam.

explode string to array and implode back to string (just because)

Duis posuere nunc sit amet sapien pharetra, at scelerisque risus fringilla. Aenean sed purus nec quam ullamcorper aliquam.

PHP: parse_url()

PHP

$url=parse_url("http://www.amazon.com/s/ref=nb_sb_noss_2/188-0127043-7511934?url=search-alias%3Daps&field-keywords=camera");

print_r($url);

//Result 

Array ( [scheme] => http [host] => www.amazon.com [path] => /s/ref=nb_sb_noss_2/188-0127043-7511934 [query] => url=search-alias%3Daps&field-keywords=camera )

PHP: Using str_pad() to format text

PHP: Book List

$header="BOOK LIST";

$arr=array(

  'AYN RAND'=> 'Calumet K', 

  'ERNEST HEMINGWAY' =>' Wuthering Heights',

  'JOAN DIDION'=> 'Victory', 

  'RAY BRADBURY' => 'Fahrenheit 451 ',

  'GEORGE R.R. MARTIN' => 'Game of Thrones',

  'MARK TWAIN' => 'The Adventures of Tom Sawyer',

  'Stephen King' => 'The Shining',

  'James Patterson' => 'Alex Cross',

  'C. S. Lewis' => 'The Chronicles of Narnia',

  'Edgar Rice Burroughs' => 'Tarzan',

);

echo "<p>";

  

print(str_pad($header,60,"/",STR_PAD_BOTH)); //60 chars across: pad on both sides

  

echo "</p>";

foreach($arr as $author => $book){

  echo "<p>";

  print(str_pad($author,30,'.')); //30 chars across: default pad right side

  print(str_pad($book,30,'.',STR_PAD_LEFT)); //30 chars across: pad on left side

  echo "</p>";

  

} 

//Result

/////////////////////////BOOK LIST//////////////////////////

AYN RAND...........................................Calumet K

ERNEST HEMINGWAY.......................... Wuthering Heights

JOAN DIDION..........................................Victory

RAY BRADBURY.................................Fahrenheit 451

GEORGE R.R. MARTIN...........................Game of Thrones

MARK TWAIN......................The Adventures of Tom Sawyer

Stephen King.....................................The Shining

James Patterson...................................Alex Cross

C. S. Lewis.........................The Chronicles of Narnia

Edgar Rice Burroughs..................................Tarzan

PHP: usort() custom sorting

PHP

function user_compare($x, $y)

{

if ($x == $y)

return 0;

else if ($x > $y)

return 1;

else

return -1;

}

$array1 = array(22,33,66,55,11);

usort($array1, 'user_compare');

foreach($array1 as $key => $value)

{

echo "$key: $value\n";

}

PHP: foreach() loop

PHP: Circumference of planets table with alternating rows

$rad=array(
  'mercury' => 1516,
  'venus' => 3760,
  'earth' => 3959,
  'mars' => 2104,
  'jupiter' => 42982,
  'saturn' => 35615,
  'uranus' => 15700,
  'neptune' => 15256,
);

echo "<table border='1' width='300' >";
echo "<tr><td>Planet</td><td>Radius (mi)</td><td>Circumference (mi)</td></tr>";
foreach($rad as $key => $val){
  $cir=(2*M_PI)*$rad[$key];
  if($key == 'venus' || $key == 'mars' || $key == 'saturn' || $key == 'neptune'){
      echo "<tr><td><b>";
      printf("%s", $key);
      echo "</b></td>";
      echo "<td><b>";
      printf("%.2f", $val);
       echo "</b></td>";
     echo "<td><b>";
      printf("%.2f",$cir);
      echo "</b></td></tr>";
     
   }
  else{
      echo "<tr><td>";
      printf("%s", $key);
      echo "</td>";
      echo "<td>";
      printf("%.2f", $val);
      echo "</td>";
      echo "<td>";
      printf("%.2f",$cir);
      echo "</td></tr>";
     
    }

}

echo "</table>";

//Result

Planet	Radius (mi)	Circumference (mi)
mercury	1516.00	9525.31
venus	3760.00	23624.78
earth	3959.00	24875.13
mars	2104.00	13219.82
jupiter	42982.00	270063.87
saturn	35615.00	223775.64
uranus	15700.00	98646.01
neptune	15256.00	95856.28