Php function why can not take name like...

Question

Why php function not take this type(small letters) name.

Problem 1 :
<?php
function writemsg() {
echo 'Iam vinay';
}
writemsg();
?>

when i use this function the output not come, when i will change function name like writeMsg. it show output.

1) function not allowed name like writemsg()

Answer 1

I'm not sure what you mean, but function names in PHP are not case sensitive.

<?php
function writemsg() {
echo 'I am vinay';
}
// although all 3 calls use different capitalization they
// should all still output the echo in the function.
writemsg();
WriteMsg();
writeMsg();
?>

Answer 2

Thank you bro