- #Php for loop in html to hide info how to
- #Php for loop in html to hide info archive
- #Php for loop in html to hide info code
And no, it doesn't actually test if a variable is set or not by my definition "$v is set if unset($v) has no effect". In response to 1 06:02, isset($v) is in all (except possibly buggy) cases equivalent to !is_null($v). Everytime an E_NOTICE error happens, the file it originated from will be loaded into an array. This will make the handler only handle var_exists, but it adds a lot of overhead. Notice: Undefined variable: j in filename.php on line 26
#Php for loop in html to hide info code
And if you have any E_NOTICE errors caused by other code between the set_error_handler and restore_error_handler they will not be dealt with properly. The problem is, the set_error_handler and restore_error_handler calls can not be inside the function, which means you need 2 extra lines of code every time you are testing. It makes use of the fact that an unset variable will throw an E_NOTICE error, but one initialized as NULL will not.
#Php for loop in html to hide info how to
The following is an example of how to test if a variable is set, whether or not it is NULL. Return isset( $bar -> inexistent ) || array_key_exists ( 'inexistent', get_object_vars ( $bar )) Return isset( $bar -> foo ) || array_key_exists ( 'foo', get_object_vars ( $bar )) Return isset( bar :: $inexistent ) || array_key_exists ( 'inexistent', get_class_vars ( 'bar' )) Return isset( bar :: $foo ) || array_key_exists ( 'foo', get_class_vars ( 'bar' )) Return isset( $array ) || array_key_exists ( 'inexistent', $array ) Return isset( $array ) || array_key_exists ( 'foo', $array ) Now this is how to achieve the same effect (ie, having isset() returning true even if variable has been set to null) for objects and arrays Var_dump ( $def -> ghi -> jkl ) // null / E_NOTICE: Trying to get property of non-object Var_dump ( $def -> ghi ) // null / E_NOTICE: Trying to get property of non-object Var_dump ( $def ) // null / E_NOTICE: Trying to get property of non-object Var_dump ( $abc -> def -> ghi -> jkl ) // null / E_NOTICE: Trying to get property of non-object Var_dump ( $abc -> def -> ghi ) // null / E_NOTICE: Trying to get property of non-object Var_dump ( $abc ) // object(stdClass)#1 (1) Var_dump (isset( $def -> ghi -> jkl )) // bool(false) Var_dump (isset( $def -> ghi )) // bool(false) Var_dump (isset( $abc -> def -> ghi -> jkl )) // bool(false) Var_dump (isset( $abc -> def -> ghi )) // bool(false) Var_dump (isset( $abc -> def )) // bool(true) Without raising any errors, warnings or notices.
Isset($abc) & isset($abc->def) & isset($abc->def->ghi) You can safely use isset to check properties and subproperties of objects directly.
#Php for loop in html to hide info archive
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