What is the meaning of \x00 , \x04 in PHP

Question

i have some codes having the \\x00 and \\x04 hex codes, what does it means?

$str= implode(\"\\x00\",          


        

Answer 1

\x indicates hexadecimal notation. See: PHP strings

Have a look at an ASCII table to see what 0x00 and 0x04 represent.

0x00 = NULL
0x04 = EOT (End of transmission)