understanding iterating loop by example

<?php
//following loop will iterate 66 times
$index = 1;
for($i = 0; $i <= 10; $i++){
    for($j = 0; $j <= 5; $j++){
        echo $index . " ) ";
        echo $i . ', ' . $j;
        echo '<br>';
        $index++;
    }
}
echo '<hr>';
//This following loop will be iterate 55 times
$index = 1;
for($i = 0; $i <= 10; $i++){
    for($j = 0; $j <= 5; $j++){
        if($j == 0){
            continue;
        }
        echo $index . " ) ";
        echo $i . ', ' . $j;
        echo '<br>';
        $index++;
    }
}

echo '<hr>';
//This following loop will be iterate 60 times
$index = 1;
for($i = 0; $i <= 10; $i++){
        if($i == 0){
            continue;
        }
    for($j = 0; $j <= 5; $j++){
        echo $index . " ) ";
        echo $i . ', ' . $j;
        echo '<br>';
        $index++;
    }
}

findings frequency number from array using foreach loop

<?php
/**
 * Created by PhpStorm.
 * User: Polo-Dev
 * Date: 29-Aug-15
 * Time: 9:20 AM
 */
$string = "hi how are you hi you";
$words = explode(" ", $string);
$new_array = array();

foreach ($words as $word) {
   if(array_key_exists($word, $new_array)){
       $new_array[$word] ++;
   } else {
       $new_array[$word] = 1;
   }
}

foreach($new_array as $key => $value){
    echo "$key => $value <br>";
}

findings frequency number from array using for loop

<?php
/**
 * Created by PhpStorm.
 * User: Polo-Dev
 * Date: 29-Aug-15
 * Time: 9:20 AM
 */
$string = "hi how are you hi you";
$array = explode(" ", $string);
$length = count($array);
$new_array = array();
for($i = 0; $i < $length; $i++){
    if(array_key_exists($array[$i], $new_array)){
        $new_array[$array[$i]] ++;
    }else{

        $new_array[$array[$i]] = 1;
    }
}
foreach($new_array as $key => $value){
    echo "$key => $value <br>";
}

PHP logical expression and php logic building with increments, decrements, while loop, if else statement

Question 1:

<?php 
$x = 0; 
$y = $x--;
$z = --$x;
echo “x=$x,y=$y,z=$z”
?>
a. x = 0 , y = 0 , z = -1
b. x = -1 , y = -1 , z = -2
c. x = -2 , y = 0 , z = -2
d. x = 0 , y = 0 , z = -2


Question 2:

<?php 
$x = 0; 
$y = --$x  + 1 ;
$z = --$y -1;
echo “x=$x,y=$y,z=$z”
?>
e. x = 0 , y = 0 , z = -2
f. x = -1 , y = -1 , z = -2
g. x = -2 , y = 0 , z = -2
h. x = 0 , y = 0 , z = -2


Question 3:

<?php 
$x = 0; 
$y = $x--;
$z = --$y;
echo “x=$x,y=$y,z=$z”
?>
i. x = -1, y = -1, z = -1
j. x = -1, y = -1, z = -2
k. x = -1, y = -2, z = -2
l. x = 0, y = 0, z = -2

Question 4:

<?php 
$x = 0; 
$y = $x - 1;
$x = $y--;
$z = --$x;
echo “x=$x,y=$y,z=$z”
?>
m. x = 0, y = 0, z = -1
n. x = -1, y = -1, z = -2
o. x = -2, y = 0, z = -2
p. x = -2, y = -2, z = -2

Question 5:

<?php 
$x = -1; 
$y = $x + 1;
$z = ++$x + $y ;
echo “x=$x,y=$y,z=$z”
?>
q. x = 0, y = 0, z = 0
r. x = -1, y = -1, z = -2
s. x = -2, y = 0, z = -2
t. x = 0, y = 0, z = -2

Question 6:

<?php 
$x = 0; 
$y = $x--;
$z = ($x++) + $y;
echo “x=$x,y=$y,z=$z”
?>
u. x = 0, y = 0, z = -1
v. x = -1, y = -1, z = -2
w. x = -2, y = 0, z = -2
x. x = 0, y = 0, z = -2

Question 7:

<?php 
$x = 0; 
$y = (--$x) + 1;
$z = --$x + (++$y);
echo “x=$x,y=$y,z=$z”
?>
y. x = 0, y = 0, z = -1
z. x = -1, y = -1, z = -2
aa. x = -2, y = 1, z = -1
bb. x = 0, y = 1, z = -2


Question 8:

<?php 
$x = 0; 
$y = $x--;
$y = --$x;
$y--;
$z = --$x;
echo “x=$x,y=$y,z=$z”
?>
cc. x = -3, y = -2, z = -3
dd. x = -3, y = -1, z = -3
ee. x = -2, y = -2, z = -2
ff. x = -3, y = -3, z = -3

Question 9:

<?php 
$x = 0; 
$y = $x + 1;
$z = (--$x)  + ($y++);
echo “x=$x,y=$y,z=$z”
?>
gg. x = -1, y = 2, z = -1
hh. x = -1, y = 2 , z = 0
ii. x = -2, y = 1, z = -2
jj. x = -1, y = 2, z = -2

Question 10:
$i = 0;
while($i == 0){
   echo $i;
   $i++;
}
/*
*out put 0
*/

Question 11:
$i = 5;
while($i--){
echo $i . ", ";
}
/*
*out put  4, 3, 2, 1, 0,
*/

Question 12:
$x = -1;
if($x++){
echo "if";
} else {
echo "else";
}
/*
*out put if 
*/

Question 13:
$x = -1;
if(++$x){
echo "if";
} else {
echo "else";
}
/*
*out put else 
*/

converting for loop to while loop

/*
 *converting for loop to while loop
 * */
for($i = 0; $i < 5; $i++){
   echo $i;
}

$i = 0;
while($i < 5){
   echo $i;
   $i++;
}