Dev {Tricks}

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SPF/DKIM/DMARC Tools

SPF/DKIM/DMARC deployment tools fall into 2 categories: generators (creators/builders) to generate records and checkers (validators/testers) to look up the DNS.

SPF Tools

To create/generate an SPF record, there is the SPF record generator, or SPF record creator/builder, which takes these mechanisms and qualifiers: mx, a, ip4, ip6, include, and all, and returns an SPF record.

To check an SPF record, there is the SPF record checker, or SPF record validator/tester, which checks if an SPF record is published on your domain, and if its syntax is correct.

DKIM Tools

To create/generate a DKIM record, there is the DKIM record generator, or DKIM record creator/builder, which takes a domain and a selector, and returns a DKIM record.

To check a DKIM record, there is the DKIM record checker, or DKIM record validator/tester, which checks if a DKIM record is published on your domain, and if its syntax is correct.

DMARC Tools

To create/generate a DMARC record, there is the DMARC record generator, or DMARC record creator/builder, which takes these tags: p, rua, ruf, sp, adkim, and aspf, and returns a DMARC record.

To check a DMARC record, there is the DMARC record checker, or DMARC record validator/tester, which checks if a DMARC record is published on your domain, and if its syntax is correct.

Learn More

SPF/DKIM/DMARC Wizard

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Associative arrays – How to loop over Associative arrays

Associative arrays

  • Associative arrays in PHP are arrays that use named keys instead of numeric indexes.
  • This – makes them more expressive and useful when dealing with key-value pairs.
  • Associative arrays can be defined using the array() function or the short array syntax [].

// How to create

$person1 = array("first_name" => "John", "last_name" => "Doe");
$person2 = ["first_name" => "Jane", "last_name" => "Smith"];

// Accessing Values

echo $person1["first_name"];

//Looping Through an Associative Array

foreach ($person1 as $key => $value) {
    echo "$key : $value<br />";
}

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Indexed Arrays. How to loop over Indexed Arrays.

// M7C1-LV

Indexed Arrays //24:10-indexed array

You can create an indexed array using the array() function or the short array syntax [].

How to create

$fruits1=array("apple","banana","cherry");
$fruits2=["apple","banana","cherry"];
  • Simple echo will not show the array result without []
  • print_r is use to get array result
print_r($fruits1);
print_r($fruits2);

// Accessing Values of Indexed Array

echo $fruits1[2];
print_r($fruits2[1]);

How to loop over Indexed Arrays // 28:30

// For Loop through an Indexed Array

for ($i=0; $i<count($fruits1); $i++){
echo $fruits1[$i]."\n";
}

// foreach Loop through an Indexed Array

$app=['Android','IOS','Windows','Linux'];
foreach($app as $item){
echo $item."\n";
}

 

 

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PHP Break | Continue

Break

It is used to exit a loop prematurely. Once break is encountered, the loop terminates and the program resumes execution after the loop.

for ($i = 0; $i < 10; $i++) {
    if ($i == 3) {
    break;
    }
    echo $i . "<br />";
}

Continue

The continue statement is used to skip the rest of the current loop iteration and proceed to the evaluation of the loop condition for the next iteration.

for ($x=0;$x<16;$x=$x+1){ 
    if($x%2==0){ 
        continue; 
    } 
    echo $x; 
}

 



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For Loop | While Loop | Do…While Loop | Foreach Loop


For Loop


Used when you know in advance how many times you want to execute a statement or a block of

statements.


for($x = 0; $x <= 5; $x++) {
    echo "The number is: $x";
}


While Loop


It executes a block of code as long as the specified condition is true.


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


Do…While Loop


$x = 1;
do {
    echo "The number is: $x ";
    $x++;
} while ($x <= 5);


Foreach Loop


Used for looping through arrays. For each loop iteration, the value of the current array element is

assigned to the value variable and the array pointer is moved by one, until it reaches the last array

element.


$colors = array("red", "green", "blue", "yellow");
foreach ($colors as $value) {
    echo "$value";
}


$age = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
foreach($age as $key => $value) {
    echo "$key is $value years old. ";
}