Binary-safe function_PHP tutorial

Binary security functions refer to functions or operations performed on a binary file that do not change the file contents. This ensures that the file is not corrupted by certain operations. Binary data is encoded as a sequence of 0s and 1s. Most programs will assign different format codes to certain special bit strings, so when a user uses a program to read a binary file, the file will be interpreted according to the rules of the program. If the format encoding used by this program is consistent with the format encoding in which the file is written, then the file can be read normally. Otherwise, some meaningless symbols will be appended to the format code of the file, which may also cause file damage. . If the worst happens, such an operation can result in permanent loss of your data due to corruption. So you should save important files on read-only storage media, such as CD-ROMs.