$a = $b = $c = $d = array();
## ASSIGNING MULTIPLE VARIABLE IN PHP
$var1 = $var2 = $var3 = $var4 = "String";
$var1 = $var2 = $var3 = $var4 = 4;
$var1 = $var2 = $var3 = $var4 = {};
$var1 = $var2 = $var3 = $var4 = [];
# Initialize multiple regular variables with values
$a = $b = $c = 'Hello PHP';
echo $a.'<br>',$b.'<br>', $c.'<br>';
Output:
*******
Hello PHP
Hello PHP
Hello PHP