Obfuscated php functions addcslashes ($ str, 'M'); & nbsp; escape before specified characters & nbsp; stripcslashes ($ str) remove the escape of this function. addslashes (string) is easy to confuse with php functions.
Addcslashes ($ str, 'M'); escape stripcslashes ($ str) before a specified character to remove the escape of this function
Addslashes (string) pre-defined escape stripslashes remove the escape of this function
No isset = false empty = true is displayed in the variable.
Implode array-> str
Emplode str-> array
Array_key_exists ($ key, array) $ whether the key is in the array key
In_array ($ value, array) $ whether value is in the value of array
Ob_start () open the buffer
Ob_get_contents () returns the buffer content
Ob_end_clean () clears the buffer and closes the buffer.
Test code:
Ob_start (); echo "content after ob_start will not be output
"; $ Out = ob_get_contents (); ob_end_clean (); echo" content output after ob_end_clean
"; Echo $ out;
Output result:
Content after ob_end_clean is output. content after ob_start is not output.
Url encoded by urlencode is % hexadecimal
Url decoded by urldecode
Delimiters
Constant () supports variable constants
Defines a case-insensitive constant:
Const and define
Define cannot be defined in the class, and const must be defined in the class, and const must be accessed through the class name: variable name; "$" is not recommended before the constant name
class Person{ const COUNTRY="china";}echo Person::COUNTRY;
