Attribute Syntax Comparisons

attributes.php

<?php

class FooCurrent {
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * Some sensible description
     *
     * @Assert\Length(max=255)
     * @Assert\NotBlank()
     * @ORM\Column(type="string", nullable=true)
     * @Groups({"public", "address"})
     */
    private $email;
}

class FooAtAt {
    @@ORM\Id
    @@ORM\GeneratedValue
    @@ORM\Column(type="integer")
    private $id;

    /**
     * Some sensible description
     */
    @@Assert\Length(max=255)
    @@Assert\NotBlank()
    @@ORM\Column(type="string", nullable=true)
    @@Groups({"public", "address"})
    private $email;
}

class FooHashBrackets {
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column(type="integer")]
    private $id;

    /**
     * Some sensible description
     */
    #[Assert\Length(max=255)]
    #[Assert\NotBlank()]
    #[ORM\Column(type="string", nullable=true)]
    #[Groups({"public", "address"})]
    private $email;
}

class FooHashBracketsGrouped {
    #[
        ORM\Id,
        ORM\GeneratedValue,
        ORM\Column(type="integer")
    ]
    private $id;

    /**
     * Some sensible description
     */
    #[
        Assert\Length(max=255),
        Assert\NotBlank(),
        ORM\Column(type="string", nullable=true),
        Groups({"public", "address"})
    ]
    private $email;
}

class FooAtBrackets {
    @[ORM\Id]
    @[ORM\GeneratedValue]
    @[ORM\Column(type="integer")]
    private $id;

    /**
     * Some sensible description
     */
    @[Assert\Length(max=255)]
    @[Assert\NotBlank()]
    @[ORM\Column(type="string", nullable=true)]
    @[Groups({"public", "address"})]
    private $email;
}

class FooAtBracketsGrouped {
    @[
        ORM\Id,
        ORM\GeneratedValue,
        ORM\Column(type="integer")
    ]
    private $id;

    /**
     * Some sensible description
     */
    @[
        Assert\Length(max=255),
        Assert\NotBlank(),
        ORM\Column(type="string", nullable=true),
        Groups({"public", "address"})
    ]
    private $email;
}

class FooShifts {
    <<ORM\Id>>
    <<ORM\GeneratedValue>>
    <<ORM\Column(type="integer")>>
    private $id;

    /**
     * Some sensible description
     */
    <<Assert\Length(max=255)>>
    <<Assert\NotBlank()>>
    <<ORM\Column(type="string", nullable=true)>>
    <<Groups({"public", "address"})>>
    private $email;
}

class FooShiftsGrouped {
    <<
        ORM\Id,
        ORM\GeneratedValue,
        ORM\Column(type="integer")
    >>
    private $id;

    /**
     * Some sensible description
     */
    <<
        Assert\Length(max=255),
        Assert\NotBlank(),
        ORM\Column(type="string", nullable=true),
        Groups({"public", "address"})
    >>
    private $email;
}

It looks like @@Attribute is the only rational decision, so the PHP internals will go with something else, of course.

None of them write actual PHP or manage PHP teams for a living.

@@Attribute is the only rational decision

Based on what rationale?