Lecture_5-PHP Functions.pdf

PHP FUNCTIONS (STRING, ARRAY, MATH, DATE/TIME, MISCELLANEOUS) PHP String Functions  substr() Function  The substr() function returns a part of a string.  Syntax: substr(string,start,length);   strtoupper() Function  The strtoupper() function converts a string to u...

PHP FUNCTIONS (STRING, ARRAY, MATH, DATE/TIME, MISCELLANEOUS) PHP String Functions  substr() Function  The substr() function returns a part of a string.  Syntax: substr(string,start,length);   strtoupper() Function  The strtoupper() function converts a string to uppercase.  Syntax: strtoupper(string) ;  strtolower() function converts a string to lowercase.  PHP String Functions  strlen() Function  The strlen() function returns the length of a string.  Syntax: strlen(string) ;   trim() Function  The trim() function removes whitespace and other predefined characters from both sides of a string.  Syntax:trim(string,charlist) ;  ltrim() - Removes whitespace or other predefined characters from the left side of a string.  rtrim() - Removes whitespace or other predefined characters from the right side of a string.  PHP String Functions  strrev() Function  The strrev() function reverses a string.  Syntax: strrev(string) ;  explode() Function  The explode() function breaks a string into an array.  Syntax: explode(separator,string) ; 