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php empty form field
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| <!DOCTYPE html> | |
| <html> | |
| <body> | |
| <?php | |
| function empty_field_empty($str) { | |
| return empty($str); | |
| } | |
| function empty_field_isstr($str) { | |
| $has_text = !is_string($str) && strlen($str) > 0; | |
| return !$has_text; | |
| } | |
| function empty_field_isbool($str) { | |
| $has_text = !is_bool($str) && strlen($str) > 0; | |
| return !$has_text; | |
| } | |
| $arr = array("NULL"=>NULL, | |
| "bool+"=>true, | |
| "bool-"=>false, | |
| "empty"=>"", | |
| "num 0"=>0, | |
| "num 1"=>1, | |
| "space"=>" ", | |
| "str 0"=>'0', | |
| "str 1"=>'1', | |
| "str 1"=>'1', | |
| "str true"=>'true', | |
| "str false"=>'false'); | |
| echo "</br></br>Is empty field, using empty():</br>"; | |
| if (empty_field_empty($x)) { | |
| echo "unset -> true</br>"; | |
| } else echo "unset -> false</br>"; | |
| foreach ($arr as $key => $val) { | |
| if (empty_field_empty($val)) { | |
| echo "$key -> true</br>"; | |
| } else echo "$key -> false</br>"; | |
| } | |
| echo "</br></br>Is empty field, using is_string and strlen:</br>"; | |
| if (empty_field_isstr($x)) { | |
| echo "unset -> true</br>"; | |
| } else echo "unset -> false</br>"; | |
| foreach ($arr as $key => $val) { | |
| if (empty_field_isstr($val)) { | |
| echo "$key -> true</br>"; | |
| } else echo "$key -> false</br>"; | |
| } | |
| echo "</br></br>Is empty field, using is_bool and strlen:</br>"; | |
| if (empty_field_isbool($x)) { | |
| echo "unset -> true</br>"; | |
| } else echo "unset -> false</br>"; | |
| foreach ($arr as $key => $val) { | |
| if (empty_field_isbool($val)) { | |
| echo "$key -> true</br>"; | |
| } else echo "$key -> false</br>"; | |
| } | |
| ?> | |
| </body> | |
| </html> |
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Output:
Is empty field, using empty():
unset -> true
NULL -> true
bool+ -> false
bool- -> true
empty -> true
num 0 -> true
num 1 -> false
space -> false
str 0 -> true
str 1 -> false
str true -> false
str false -> false
Is empty field, using is_string and strlen:
unset -> true
NULL -> true
bool+ -> false
bool- -> true
empty -> true
num 0 -> false
num 1 -> false
space -> true
str 0 -> true
str 1 -> true
str true -> true
str false -> true
Is empty field, using is_bool and strlen:
unset -> true
NULL -> true
bool+ -> true
bool- -> true
empty -> true
num 0 -> false
num 1 -> false
space -> false
str 0 -> false
str 1 -> false
str true -> false
str false -> false