ReflectionClass::getConstant

    (PHP 5, PHP 7, PHP 8)

    ReflectionClass::getConstant — Gets defined constant

    Опис

    public ReflectionClass::getConstant(string $name): mixed

    Gets the defined constant.

    Параметри

    name

    The name of the class constant to get.

    Значення, що повертаються

    Value of the constant with the name name. Returns false if the constant was not found in the class.

    Приклади

    Приклад #1 Usage of ReflectionClass::getConstant()

    <?php

    class Example {
    const     C1 = false;
    const     C2 = 'I am a constant';
    }

    $reflection = new ReflectionClass('Example');

    var_dump($reflection->getConstant('C1'));
    var_dump($reflection->getConstant('C2'));
    var_dump($reflection->getConstant('C3'));
    ?>

    Поданий вище приклад виведе:

    bool(false)
string(15) "I am a constant"
bool(false)

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    User Contributed Notes 2 notes

    up
    6
    aurelien dot tisserand at wavesoftware dot ch
    11 years ago
    If the $name constant doesn't exist in the targetted class the function returns bool(false), not empty nor null but false (you to test with "==="

    $constFounded = false ;
    $this->currentlangClass = new ReflectionClass($langFile);
    $this->currentlangClass->getConstant($constant);
    if($myConst !== false){
    $constFounded = true ;
    }
    up
    4
    Bhimsen
    12 years ago
    The "getconstant" method can be used to get the value associated with a constant
    of a particular class that you are examining.
    The following code snippet shows this:

    <?php
    class Test{
    const     ONE = "Number one";
    const     TWO = "Number two";
    }

    $obj = new ReflectionClass( "Test" );
    echo     $obj->getconstant( "ONE" )."\n";
    echo     $obj->getconstant( "TWO" )."\n";

    ?>

    output:
    Number one
    Number two
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