Creating Patterns (Demo) using for loop

Pattern #1

Creating a growing triangle of stars in ten rows.

Source code:

for($i=1; $i<=10; $i++){
    for($j=1; $j<=$i; $j++){
        echo "*";
    }
    echo "<br>";
}

Pattern #2

Source code:

for($i=1; $i<=10; $i++){
    for($j=1; $j<=$i; $j++){
        echo "*";
    }
    for($k=$j; $k<=10; $k++){
        echo "-";
    }
    echo "<br>";
}

Pattern #3

Source code:

for($i=1; $i<=10; $i++){
    for($j=1; $j<=(10-$i); $j++){
        echo '*';
    }
    echo '<br>';
}

Pattern #4

Use   in the first loop to add blank space.

Source code:

for($i=1; $i<=10; $i++){
    for($j=$i; $j<=10; $j++){
        echo '&nbsp;';
    }
    for($k=1; $k<=(2*$i-1); $k++){
        echo '*';
    }
    echo '<br>';
}

Pattern #5

Source code:

for($i=10; $i>=0; $i--){
    for($j=$i; $j<=10; $j++){
        echo '&nbsp;';
    }
    for($k=1; $k<=(2*$i-1); $k++){
        echo '*';
    }
    echo '<br>';
}

Pattern #6

Source code:

for($i=0; $i<=12; $i++){
    for($j=$i; $j<=11; $j++){
        echo '*';
    }
    for($k=1; $k<=(2*$i); $k++){
        echo '&nbsp;';
    }
    for($j=$i; $j<=11; $j++){
        echo '*';
    }
    echo '<br>';
}

Tutorial on For loop

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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