آموزش PHP قسمت سوم

if (condition) {
  code to be executed if condition is true;
}

<?php

  $t = date("H");

  if ($t < "20") {
    echo "Have a good day!";
  }

?>

if (condition) {
  code to be executed if condition is true;
} else {
  code to be executed if condition is false;
}

<?php

  $t = date("H");

  if ($t < "20") {
    echo "Have a good day!";
  } else {
    echo "Have a good night!";
  }

?>

if (condition) {
  code to be executed if this condition is true;
} elseif (condition) {
  code to be executed if first condition is false and this condition is true;
} else {
  code to be executed if all conditions are false;
}

<?php

  $t = date("H");

  if ($t < "10") {
    echo "Have a good morning!";
  } elseif ($t < "20") {
    echo "Have a good day!";
  } else {
    echo "Have a good night!";
  }

?>

switch (n) {
  case label1:
    code to be executed if n=label1;
    break;
  case label2:
    code to be executed if n=label2;
    break;
  case label3:
    code to be executed if n=label3;
    break;
    ...
  default:
    code to be executed if n is different from all labels;
}

<?php

  $favcolor = "red";

  switch ($favcolor) {
    case "red":
      echo "Your favorite color is 
  red!";
      break;
    case "blue":
      echo "Your favorite color is 
  blue!";
      break;
    case "green":
      echo "Your favorite color is 
  green!";
      break;
    default:
      echo "Your favorite color is 
  neither red, blue, nor green!";
  }

?>

while (condition is true) {
  code to be executed;
}

<?php
 
  $x = 1;
 
  while($x <= 5) {
    echo "The number is: $x <br>";
    $x++;
  } 

?>

<?php 
 
  $x = 0;
 
  while($x <= 100) {
    echo "The number is: $x <br>";
    $x+=10;
  }

?>

do {
  code to be executed;
} while (condition is true);

<?php

  $x = 1;

  do {
    echo "The number is: $x <br>";
    $x++;
  } while ($x <= 5);

?>

<?php

  $x = 6;

  do {
    echo "The number is: $x <br>";
    $x++;
  } while ($x <= 5);

?>

for (init counter; test counter; increment counter) {
  code to be executed for each iteration;
}

<?php

  for ($x = 0; $x <= 10; $x++) {
    echo "The number is: $x <br>";
  }

?>

<?php
 
  for ($x = 0; $x <= 100; $x+=10) {
    echo "The number is: $x <br>";
  }

?> 

foreach ($array as $value) {
  code to be executed;
}

<?php
 
  $colors = array("red", "green", 
  "blue", "yellow"); 

  foreach ($colors as $value) {
    echo "$value <br>";
  }

?>

<?php

  $age = array("Peter"=>"35", 
  "Ben"=>"37", "Joe"=>"43");

  foreach($age as $x => $val) {
    echo "$x = $val<br>";
  }

?>

<?php 
 
  for ($x = 0; $x < 10; $x++) {
    if ($x == 4) {
      break;
    }
    echo "The number is: $x <br>";
  }

?>

<?php 
 
  for ($x = 0; $x < 10; $x++) {
    if ($x == 4) {
      continue;
    }
    echo "The number is: $x <br>";
  }

?>

<?php 
 
  $x = 0;
 
  while($x < 10) {
    if ($x == 4) {
      break;
    }
    echo "The number is: $x <br>";
    $x++;
  } 

?> 

<?php
  
  $x = 0;
 
  while($x < 10) {
    if ($x == 4) {
      $x++;
      continue;
    }
    echo "The number is: $x <br>";
    $x++;
  } 

?>

function functionName() {
  code to be executed;
}

<?php

  function writeMsg() {
    echo "Hello world!";
  }

  writeMsg();

?>

<?php

  function familyName($fname) {
    echo "$fname Refsnes.<br>";
  }

  familyName("Jani");
  familyName("Hege");
  familyName("Stale");
  familyName("Kai Jim");
  familyName("Borge");

?>

<?php

  function familyName($fname, $year) {
    echo "$fname Refsnes. Born in $year <br>";
  }

  familyName("Hege","1975");
  familyName("Stale","1978");
  familyName("Kai Jim","1983");

?>

<?php

  function addNumbers( $a, $b) {
    return $a + $b;
  }
  echo addNumbers(5, "5 days"); 
  // since strict is NOT enabled "5 days" is changed to int(5), and 
  // it will return 10

?>

<?php declare(strict_types=1); // strict requirement

  function addNumbers(int $a, int $b) {
    return $a + $b;
  }
  echo addNumbers(5, "5 days"); 
  // since strict is enabled and "5 days" is not an integer, an 
  // error will be thrown

?>

<?php declare(strict_types=1); // strict requirement

  function setHeight(int $minheight = 50) {
      echo "The height is : $minheight <br>";
  }

  setHeight(350);
  setHeight();
  setHeight(135);
  setHeight(80);

?>

<?php declare(strict_types=1); // strict requirement ?>
<!DOCTYPE html>
<html>
<body>

<?php
function sum(int $x, int $y) {
  $z = $x + $y;
  return $z;
}

echo "5 + 10 = " . sum(5,10) . "<br>";
echo "7 + 13 = " . sum(7,13) . "<br>";
echo "2 + 4 = " . sum(2,4);
?>

</body>
</html>

<?php declare(strict_types=1); // strict requirement
function addNumbers(float $a, float $b) : float {
  return $a + $b;
}
echo addNumbers(1.2, 5.2); 
?>

<?php declare(strict_types=1); // strict requirement
function addNumbers(float $a, float $b) : int {
  return (int)($a + $b);
}
echo addNumbers(1.2, 5.2); 
?>

<?php
function add_five(&$value) {
  $value += 5;
}

$num = 2;
add_five($num);
echo $num;
?>

<?php

  $cars = array("Volvo", "BMW", "Toyota"); 
  echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";

?>

$cars1 = "Volvo";
$cars2 = "BMW";
$cars3 = "Toyota";

array();

<?php

  $cars = array("Volvo", "BMW", 
  "Toyota");
  echo count($cars);

?>

$cars = array("Volvo", "BMW", "Toyota");

$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";

<?php

  $cars = array("Volvo", "BMW", "Toyota"); 
  echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";

?>

<?php

  $cars = array("Volvo", "BMW", "Toyota");
  $arrlength = count($cars);

  for($x = 0; $x < $arrlength; $x++) {
    echo $cars[$x];
    echo "<br>";
  }

?>

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

$age['Peter'] = "35";
$age['Ben'] = "37";
$age['Joe'] = "43";

<?php

  $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
  echo "Peter is " . $age['Peter'] . " years old.";

?>

<?php

  $age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");

  foreach($age as $x => $x_value) {
    echo "Key=" . $x . ", Value=" . $x_value;
    echo "<br>";
  }

?>

$cars = array (
  array("Volvo",22,18),
  array("BMW",15,13),
  array("Saab",5,2),
  array("Land Rover",17,15)
);

<?php

$cars = array (
  array("Volvo",22,18),
  array("BMW",15,13),
  array("Saab",5,2),
  array("Land Rover",17,15)
);
  
echo $cars[0][0].": In stock: ".$cars[0][1].", sold: ".$cars[0][2].".<br>";
echo $cars[1][0].": In stock: ".$cars[1][1].", sold: ".$cars[1][2].".<br>";
echo $cars[2][0].": In stock: ".$cars[2][1].", sold: ".$cars[2][2].".<br>";
echo $cars[3][0].": In stock: ".$cars[3][1].", sold: ".$cars[3][2].".<br>";

?>

<?php

$cars = array (
  array("Volvo",22,18),
  array("BMW",15,13),
  array("Saab",5,2),
  array("Land Rover",17,15)
);
    
for ($row = 0; $row < 4; $row++) {
  echo "<p><b>Row number $row</b></p>";
  echo "<ul>";
  for ($col = 0; $col < 3; $col++) {
    echo "<li>".$cars[$row][$col]."</li>";
  }
  echo "</ul>";
}

?>

<?php

$cars = array("Volvo", "BMW", "Toyota");
sort($cars);

$clength = count($cars);
for($x = 0; $x < $clength; $x++) {
  echo $cars[$x];
  echo "<br>";
}

?>

<?php

$numbers = array(4, 6, 2, 22, 11);
sort($numbers);

$arrlength = count($numbers);
for($x = 0; $x < $arrlength; $x++) {
  echo $numbers[$x];
  echo "<br>";
}

?>

<?php

$cars = array("Volvo", "BMW", "Toyota");
rsort($cars);

$clength = count($cars);
for($x = 0; $x < $clength; $x++) {
  echo $cars[$x];
  echo "<br>";
}

?>

<?php

$numbers = array(4, 6, 2, 22, 11);
rsort($numbers);

$arrlength = count($numbers);
for($x = 0; $x < $arrlength; $x++) {
  echo $numbers[$x];
  echo "<br>";
}

?>

<?php

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
asort($age);

foreach($age as $x => $x_value) {
  echo "Key=" . $x . ", Value=" . $x_value;
  echo "<br>";
}

?>

<?php

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
ksort($age);

foreach($age as $x => $x_value) {
  echo "Key=" . $x . ", Value=" . $x_value;
  echo "<br>";
}

?>

<?php

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
arsort($age);

foreach($age as $x => $x_value) {
  echo "Key=" . $x . ", Value=" . $x_value;
  echo "<br>";
}

?>

<?php

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
krsort($age);

foreach($age as $x => $x_value) {
  echo "Key=" . $x . ", Value=" . $x_value;
  echo "<br>";
}

?>