I believe the answer is true :)
A switch to kernel mode, wherein the operating system performs some action before returning control to the originating process is known to be called trap.
<h3>What is TRAP in computing?</h3>
A trap is known to be a kind of a synchronous interrupt triggered that is said to be done by an exception in that of a user process to carry out functionality.
Note that the Exception conditions such as invalid memory access, division by zero, is said to be one that can alter or trigger a trap in an OS. A trap alters the mode of an OS to that of a kernel routine.
Hence, A switch to kernel mode, wherein the operating system performs some action before returning control to the originating process is known to be called trap.
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Answer:
b. & Puihaha
Explanation:
PHP variables are supposed to start with a $ sign.
Other rules followed by PHP variables are:
Starting character in variable name (after $) must be letter or _.
Other characters in variable names can be letters,numbers or _.
a. $_Puihaha
c. $Pui_haha
d. $Puihaha
satisfy these rules.
Whereas , b. & Puihaha does not satisfy as it starts with '&'. Moreover it also contains an invalid space character in the variable.
