PHP clone clone-PHP Tutorial-php.cn

PHP clone clone

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Release： 2016-07-29 09:02:19

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Shallow cloning: only clone non-object non-resource data in the object, that is, the attributes in the object store the object type, then there will be incomplete cloning

<code><span><span><?php </span><span><span>class</span><span>B</span>{</span><span>public</span><span>$val</span> = <span>10</span>;
}

<span><span>class</span><span>A</span>{</span><span>public</span><span>$val</span> = <span>20</span>;
    <span>public</span><span>$b</span>;
    <span>public</span><span><span>function</span><span>__construct</span><span>()</span>{</span><span>$this</span>->b = <span>new</span> B();
    }
}

<span>$obj_a</span> = <span>new</span> A();
<span>$obj_b</span> = <span>clone</span><span>$obj_a</span>;
<span>$obj_a</span>->val = <span>30</span>;
<span>$obj_a</span>->b->val = <span>40</span>;

var_dump(<span>$obj_a</span>);
<span>echo</span><span>'<br>'</span>;
var_dump(<span>$obj_b</span>);</span></span></code>

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PHP clone clone

Deep cloning: all attribute data of an object To completely copy, you need to use the magic method __clone(), and implement deep cloning in it

<code><span><span><?php </span><span><span>class</span><span>B</span>{</span><span>public</span><span>$val</span> = <span>10</span>;
}

<span><span>class</span><span>A</span>{</span><span>public</span><span>$val</span> = <span>20</span>;
    <span>public</span><span>$b</span>;
    <span>public</span><span><span>function</span><span>__construct</span><span>()</span>{</span><span>$this</span>->b = <span>new</span> B();
    }
    <span>public</span><span><span>function</span><span>__clone</span><span>()</span>{</span><span>$this</span>->b = <span>clone</span><span>$this</span>->b;
    }
}

<span>$obj_a</span> = <span>new</span> A();
<span>$obj_b</span> = <span>clone</span><span>$obj_a</span>;
<span>$obj_a</span>->val = <span>30</span>;
<span>$obj_a</span>->b->val = <span>40</span>;

var_dump(<span>$obj_a</span>);
<span>echo</span><span>'<br>'</span>;
var_dump(<span>$obj_b</span>);</span></span></code>

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PHP clone clone

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