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IT Notes → PHP @ December 22, 2020

  • Serialize(), deserialize(), urlencode() and urldecode().
  • For % the result has same sign as the first operator.
  • Reference operator =& and reference parameter &param in signature.
  • $f = func1() or func2(); => ($f = func1()) || func2(); which means func2() executes only if func1() returns false.   Example: $f=func() or die(); // Remember to put $f.
  • Similarly, $f = func1() and func2(); means func2() executes only if func1() returns true.
  • The Execution Operator [Backticks ` (left to 1)].
  • Variable functions: $func(49);
  • If we set mbstring.func_overload =1 or 2 or 4 or combination in php.ini settings then we can overload   1 (“mail”) + 2 (“str”) + 4 (“ereg”) with its multibyte counterpart. So strpos will work as mb_strpos which will perform operation on even non-ASCII text.
  • call_user_func(func,   para1 …) and call_user_func_array(func, array) => Call Back Functions. If array each element is a parameter. Another way of function call.
  • connection_status( ) tells client status. CONNECTION_NORMAL => 1, CONNECTION_ABORTED => 2, CONNECTION_TIMEOUT => 3.
  • escapeshellcmd( ) To prevent/reduce risk in shell execution through PHP.
  • string exec (string command [, array &output [, int &return_val]]).
  • bool function_exists (string function_name ).
  • ignore_user_abort(true) Say for user credit card transaction php executes even if user aborts or cron job. Here script ignore user abort and runs in the background.
  • string nl2br (string str) Creates <br   /> before all.
  • string number_format (float num [, int decimals [, string decimal_point, string thousands_sep]]);
  • QUERY_STRING   + parse_str( ) => For obtaining queried parameter.
  • printf(string with format specifier, placeholder1, placeholder2);
  • void register_shutdown_function (function callback  [, mixed param [, mixed …]]);
  • sha1(): Secure Hash Algorithm. Its checksum is: 40-character hexadecimal string. Also, it is one-way encryption.
  • string strip_tags (string html_text [, string allowed_tags]) To reduce cross-site scripting XSS.
  • string wordwrap(string str [, int line_length  [, string break_chara [, bool cut]]]);

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