php - 在 block 函数 Laravel 上使用变量

Question

我需要在 laravel 4 的方法中使用一个变量，我如何将这个变量从 Eloquent 方法传递给方法 block ？

$variableonmethod=array('value1','value2');
PreAlumno::chunk(200, function($prealumnos) {
        foreach ($prealumnos as $pre) {
           //do something with variableonmethod
        }
});

Answer 1

如果你只喜欢看资料

$variableonmethod=array('value1','value2');
PreAlumno::chunk(200, function($prealumnos) use ($variableonmethod) {
    echo variableonmethod[0]; // prints `value1`
    variableonmethod[0] = 'Hola';
    echo variableonmethod[0]; // prints `Hola`
    foreach ($prealumnos as $pre) {
       //do something with variableonmethod
    }
});
echo variableonmethod[0]; // prints `value1`

但是，如果你喜欢读取数组并更改它们的值(检查 & use)

$variableonmethod=array('value1','value2');
PreAlumno::chunk(200, function($prealumnos) use (&$variableonmethod) {
    echo variableonmethod[0]; // prints `value1`
    variableonmethod[0] = 'Hola';
    echo variableonmethod[0]; // prints `Hola`
    foreach ($prealumnos as $pre) {
       //do something with variableonmethod
    }
});
echo variableonmethod[0]; // prints `Hola`