FORMULA_STARTING_CHARS FORMULA_STARTING_CHARS = array('=', '-', '+', '@') Spreadsheet formula starting character.
__construct() __construct(string $escape = "\t", array<mixed,string> $special_chars = array()) New instance. Parameters string $escape escape character to escape each CSV formula field array<mixed,string> $special_chars additional spreadsheet formula starting characters
getSpecialCharacters() getSpecialCharacters() : array<mixed,string> Returns the list of character the instance will escape. Returns array<mixed,string>
filterSpecialCharacters() filterSpecialCharacters(string ...$characters) : array<mixed,string> Filter submitted special characters. Parameters string $characters variadic Throws \InvalidArgumentException if the string is not a single character Returns array<mixed,string>
isStringable() isStringable( $value) Tell whether the submitted value is stringable. Parameters $value
