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This article will share with you a new summary of multiple-choice PHP interview questions. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
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A.Empty B.true C.false D.FALSE
echo function_exists('print');
Analysis: Because print is a language structure, function_exists() returns false; echo false is empty.
A.array B.eval C.each D.list
Analysis: array, eval, and list are language structures, and each is a function.
A.ord(65) B.chr(65) C.65 '' D.'' 65
return ? == 'A';
Analysis: ord('A') is converted to a number, chr(65) is converted to a character.
A.hello B. Empty C. Error D.hellohello
$a[bar] = 'hello'; echo $a[bar]; echo $a['bar'];
Analysis: The subscript bar can be recognized without quotation marks, but it is recommended to add quotation marks.
$arr = ['name'=>'banana'];
A.echo "{$res['name']}";
B.echo "$res['name' ]";
C.echo "{$res[name]}";
D.echo " $res[name]”;
Analysis: Within double quotes, if the array subscript is a string, single quotes cannot be added unless {} is added.
A.E_WARNING
B.E_USER_ERROR
C.E_PARSE
D.E_NOTICE
Analysis:
| E_ERROR | Fatal runtime error. This type of error is generally an unrecoverable situation, such as a problem caused by memory allocation. The consequence is that the script terminates and does not continue to run. |
| E_WARNING | Runtime warning. Only a prompt message is given, but the script does not terminate. |
| E_PARSE | Compile-time syntax parsing error. Parsing errors are generated only by the parser. |
| E_NOTICE | Runtime notification. Indicates that the script encounters a situation that may appear as an error, but there may also be similar notifications in scripts that can run normally. |
| E_USER_ERROR | User-generated error message. Similar to E_ERROR, but generated by the user using the PHP function trigger_error() in the code. |
A.E_WARNING
B.E_USER_ERROR
C.E_PARSE
D.E_NOTICE
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