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HomeBackend DevelopmentPHP TutorialSome built-in errors defined in PHP

Some built-in errors defined in PHP

Jul 18, 2018 am 10:26 AM
error

Starting from PHP7, Error was introduced and some built-in errors were defined. Here we summarize some of the defined built-in errors, which can be regarded as a record.
ArithmeticError: Error subclass, thrown when an error occurs during mathematical operations. These errors in PHP7 include performing negative displacement operations and calling intp() resulting in values ​​outside the integer range.
AssertionError: Error subclass, throws an exception when the assertion issued through assert fails. Only when ini sets zend.assertions and assert.exception to 1 and assertions are enabled, an AssertionError exception will be thrown when assert() is executed and is false.
ParseError: Error subclass, which will throw an exception when an error occurs in parsing PHP code.
TypeError: Error subclass when the parameter type passed to a function does not match its corresponding declared parameter type; the value returned from the function does not match the declared function return type; and an invalid number of parameters is passed in strict mode An exception will be thrown when giving the built-in PHP function.
pisionByZeroError: ArithmeticError subclass, throws an exception from intp() when the denominator is 0 or when 0 is used as the modulo operator (%). Using 0 in the division (/) operator will only issue a warning and the result will be NAN if the numerator is 0, and INF if the numerator is non-zero.
ArgumentCountError: Since PHP7.1, TypeError subclass throws an exception when the number of parameters passed to a user-defined function or method is less than the defined number of parameters.

<?php
declare(strict_types=1);
function foo(string $arg){
	return &#39;test&#39; . $arg;;
}
function testArithmeticError(){
	try {
        $value = 1 << -1;
    } catch (ArithmeticError $e) {
        echo &#39;show ArithmeticError:&#39;;
        echo $e->getMessage();
    }
}
function testAssertionError(){
    ini_set(&#39;zend.assertions&#39;, 1);
    ini_set(&#39;assert.exception&#39;, 1);
	try {
        assert(1>2);
    } catch (AssertionError $e) {
        echo &#39;show AssertionError:&#39;;
        echo $e->getMessage();
    }
}
function testParseError(){
    try {
        eval(&#39;asset(1>2)&#39;);
    } catch (ParseError $e) {
        echo &#39;show ParseError:&#39;;
        echo $e->getMessage();
    }
}
function testTypeError(){
    try {
        foo(123);
    } catch (TypeError $e) {
        echo &#39;show TypeError:&#39;;
        echo $e->getMessage();
    } 
}
function testpisionByZeroError(){
    try{
        1%0;
    }catch(pisionByZeroError $e){
        echo &#39;show pisionByZeroError:&#39;;
        echo $e->getMessage();
    }
}
function testArgumentCountError(){
    try{
        foo();
    }catch(ArgumentCountError $e){
        echo &#39;show ArgumentCountError:&#39;;
        echo $e->getMessage();
    }
}

//foo("ArithmeticError")();
//foo("AssertionError")();
//foo("ParseError")();
//foo("TypeError")();
//foo("pisionByZeroError")();
//foo("ArgumentCountError")();
?>

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