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file_put_contents()
file_get_contents()
fwrite()
fgets()
fread()
fopen()
fclose()
w
r
a
x
rename("oldname.txt", "newname.txt");
move("oldname.txt", "newname.txt");
change("oldname.txt", "newname.txt");
switch("oldname.txt", "newname.txt");
fopen("file.bin", "rb");
fopen("file.bin", "r");
fopen("file.bin", "w");
fopen("file.bin", "a");
filesize()
file_get_size()
file_size()
get_file_size()
fgetc()
fgetss()