Predefined Constants

The constants below are always available as part of the PHP core.

flags for escapeshellcmd():

ESCAPE_CMD_PAIR (integer)

When ESCAPE_CMD_PAIR (default) is specified, the quotation is escaped only if it is not paired. (only valid for non-Win32 environment)

ESCAPE_CMD_END (integer)

When ESCAPE_CMD_END is specified, the quotation is escaped except for the beginning/ending of string. (only valid for non-Win32 environment)

ESCAPE_CMD_ALL (integer)

When ESCAPE_CMD_ALL is specified, the quotation is always escaped. (only valid for non-Win32 environment)