Questions

Bold, Italic, Regular are known as Font Styles.

Antoine-Laurent de Lavoisier, a french chemist is considered as the "Father of Modern Chemistry."

High frequency sound attacks the tympanic memberance and makes it defective. 120 decibels is too high a pitch to be heard and therefore it impairs the hearing ability.

Yaounde is the capital of Cameroon

The chief component in the first generation computers are  Vacuum tubes.

soundex()
The soundex() function calculates the soundex key of a string. A soundex key is a four character long alphanumeric string that represent English pronunciation of a word. he soundex() function can be used for spelling applications.
< ?php
$str = "hello";
echo soundex($str);
? >

metaphone()
The metaphone() function calculates the metaphone key of a string. A metaphone key represents how a string sounds if said by an English speaking person. The metaphone() function can be used for spelling applications.
< ?php
echo metaphone("world");
? >