Returns an empty string.

Sets the return value to an empty string.

The behavior when an empty part was found changed with PHP 4.1.0. The old behavior returned an empty string, while the new, correct, behavior simply skips the part of the string

Forces the type to become a NULL value, meaning empty.

ע The write handler is not executed if the session contains no data this applies even if empty session variables are registered. This differs to the default file based session save handler, which creates empty session files.

Returns value of option with the name specified. If option is unset, an empty string is returned.

Sets the fill to bitmap clipped, empty spaces will be filled by the bitmap given by the bitmapid parameter.

With an empty prefix, the returned string will be 13 characters long. If lcg is TRUE, it will be 23 characters.

Returns the value of the configuration option on success. Failure, such as querying for a non existant value, will return an empty string.

蛁 If you need to delete all attributes with a certain name you will have to pass an empty string as the attribute value.

As of 4.0b4, PHP always outputs a character encoding by default in the Content type header. To disable sending of the charset, simply set it to be empty.

When called with a string argument they will check every character in the string and will only return TRUE if every character in the string matches the requested criteria. When called with an empty string the result will always be TRUE.

Forces conversion to a double, the default floating point type. NULL values, Booleans, resources, longs, and of course doubles remain untouched. Strings containing a number are converted to their corresponding numeric representation, otherwise resulting in 0.0. Arrays and objects are converted to 0.0 if empty, 1.0 otherwise.

Forces conversion to a long, the default integer type. NULL values, Booleans, resources, and of course longs remain untouched. Doubles are truncated. Strings containing an integer are converted to their corresponding numeric representation, otherwise resulting in 0. Arrays and objects are converted to 0 if empty, 1 otherwise.

Forces conversion to an object. Objects remain untouched. NULL values are converted to an empty object. Arrays are converted to objects by introducing their keys as properties into the objects and their values as corresponding property contents in the object. All other types result in an object with the property scalar, having the corresponding source value as content.

Forces conversion to an array. Arrays remain untouched. Objects are converted to an array by assigning all their properties to the array table. All property names are used as keys, property contents as values. NULL values are converted to an empty array. All other values are converted to an array that contains the specific source value in the element with the key 0.

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