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PHP calls function through string_PHP tutorial

Jul 13, 2016 am 10:36 AM

aspnet software programming

1. call_user_func

<span>function</span> a<span>(</span><span>$b</span><span>,</span><span>$c</span><span>)</span><span>{</span>
		<span>echo</span> <span>$b</span><span>;</span>
		<span>echo</span> <span>$c</span><span>;</span>
<span>}</span>
<span>call_user_func</span><span>(</span><span>'a'</span><span>,</span> <span>"111"</span><span>,</span><span>"222"</span><span>)</span><span>;</span>
<span>call_user_func</span><span>(</span><span>'a'</span><span>,</span> <span>"333"</span><span>,</span><span>"444"</span><span>)</span><span>;</span>
 
<span>//显示 111 222 333 444</span>
<span>?&gt;</span>
 
<span>//调用类内部的方法比较奇怪，居然用的是array，不知道开发者是如何考虑的，当然省去了new，也是满有新意的:</span>
<span>class</span> a <span>{</span>
		<span>function</span> b<span>(</span><span>$c</span><span>)</span><span>{</span>
				<span>echo</span> <span>$c</span><span>;</span>
		<span>}</span>
<span>}</span>
<span>call_user_func</span><span>(</span><span>array</span><span>(</span><span>"a"</span><span>,</span> <span>"b"</span><span>)</span><span>,</span><span>"111"</span><span>)</span><span>;</span>
 
<span>//显示 111</span>
<span>?&gt;</span>

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2. call_user_func_array

The call_user_func_array function is very similar to call_user_func, except that the parameters are passed in a different way to make the parameter structure clearer:

<span>function</span> a<span>(</span><span>$b</span><span>,</span> <span>$c</span><span>)</span><span>{</span>
		<span>echo</span> <span>$b</span><span>;</span>
		<span>echo</span> <span>$c</span><span>;</span>
<span>}</span>
<span>call_user_func_array</span><span>(</span><span>'a'</span><span>,</span> <span>array</span><span>(</span><span>"111"</span><span>,</span> <span>"222"</span><span>)</span><span>)</span><span>;</span>
 
<span>//显示 111 222</span>
<span>?&gt;</span>
 
<span>//call_user_func_array函数也可以调用类内部的方法的</span>
 
<span>Class</span> ClassA<span>{</span>
		<span>function</span> bc<span>(</span><span>$b</span><span>,</span> <span>$c</span><span>)</span> <span>{</span>
    		<span>$bc</span> <span>=</span> <span>$b</span> <span>+</span> <span>$c</span><span>;</span>
				<span>echo</span> <span>$bc</span><span>;</span>
		<span>}</span>
<span>}</span>
<span>call_user_func_array</span><span>(</span><span>array</span><span>(</span><span>'ClassA'</span><span>,</span><span>'bc'</span><span>)</span><span>,</span> <span>array</span><span>(</span><span>"111"</span><span>,</span> <span>"222"</span><span>)</span><span>)</span><span>;</span>
 
<span>//显示 333</span>
<span>?&gt;</span>

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Both the call_user_func function and the call_user_func_array function support references, which makes them more functionally consistent with ordinary function calls:

<span>function</span> a<span>(</span><span>&amp;</span><span>$b</span><span>)</span><span>{</span>
		<span>$b</span><span>++;</span>
<span>}</span>
<span>$c</span> <span>=</span> <span>0</span><span>;</span>
<span>call_user_func</span><span>(</span><span>'a'</span><span>,</span> <span>&amp;</span><span>$c</span><span>)</span><span>;</span>
<span>echo</span> <span>$c</span><span>;</span><span>//显示 1</span>
<span>call_user_func_array</span><span>(</span><span>'a'</span><span>,</span> <span>array</span><span>(</span><span>&amp;</span><span>$c</span><span>)</span><span>)</span><span>;</span>
<span>echo</span> <span>$c</span><span>;</span><span>//显示 2</span>

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