PHP has a vast set of built-in functions that every developer should know to write efficient and secure code. Here are some essential ones: 1. String Functions strlen($string): Returns the length of a string. strpos($haystack, $needle): Finds the position of the first occurrence of a substring. str_replace($search, $replace, $subject): Replaces occurrences of a string within another...

PHP Integers 2, 256, -256, 10358, -179567 are all integers. An integer is a number without any decimal part. An integer data type is a non-decimal number between -2147483648 and 2147483647 in 32 bit systems, and between -9223372036854775808 and 9223372036854775807 in 64 bit systems. A value greater (or lower) than this, will be stored as float, because it exceeds the limit of an...