PHP Call By Reference:

In PHP we can pass reference of a variable, so that we can modify the variable's value inside another function and get the modified values from where we have sent. It is much like the call by reference, in which we send the base address of the variable and we modify the values inside another function.

PHP Call By Reference Example:

function swap(&$a,&$b){

$a+=$b;

$b=$a-$b;

$a=$a-$b;

$var1=34;

$var2=90;

echo "<b>Before swapping values are \$var1= $var1 & \$var2= $var2 <br/> </b>";

swap($var1,$var2);

echo "<b>After swapping values are \$var1= $var1 & \$var2= $var2 <br/></b>";

Output:

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