Question:What are type casting and juggling? 

Answer Casting: Converting values from one data type to another is known as type casting. This is accomplished by placing the intended type in front of the variable to be cast.example:
$x=34.54;
$y=(int)$x;
echo $y; // returns 34Juggling: Variables are sometimes automatically cast to best fit the circumstances in which they are referenced. This is known as Type Juggling.example:
$a="34 items"
$total=5;
$total+=$a;
echo $total;// returns 39 

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