PHP debug_backtrace function-PHP Tutorial-php.cn

PHP debug_backtrace function

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Release： 2016-07-30 13:30:20

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PHP debug_backtrace() function generates a backtrace

This function returns an associative array.

<code>下面是可能返回的元素
</code>

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function	string	current function name
line	integer	current line number
file	String	Current file name
object	object	current object
type	string	Current call type, possible calls: Return: "->" - method call returns: "::" - static method call returns nothing - function call
args	array	If inside a function, lists the function arguments. If in the referenced file, list the referenced file name

For Example one:

<code><span><span>class</span><span>Hello</span>{</span><span>private</span><span>$var</span>;
        <span>public</span><span>$var2</span>;
        <span>protected</span><span>$var3</span>;

    <span>public</span><span><span>function</span><span>__construct</span><span>(<span>$var</span>,<span>$var2</span>,<span>$var3</span>)</span>{</span><span>$this</span>-><span>var</span>=<span>$var</span>;
            <span>$this</span>->var2=<span>$var2</span>;
            <span>$this</span>->var3=<span>$var3</span>;
        } 
   }


<span><span>function</span><span>test</span><span>(Hello <span>$hello</span>)</span>{</span><span>echo</span><span>"Hi this is a test function"</span>.<span>"<br>"</span>;
        print_r(debug_backtrace());
}

<span>$hello2</span>=<span>new</span> Hello(<span>'A'</span>,<span>'B'</span>,<span>'C'</span>);
test(<span>$hello2</span>);</code>

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The output result of example one is as follows:

Hi this is a test function
Array ( [0] => Array (
[file] => D:wwwMyProjecttestindex4.php
[line] => 52
[function] => test
[args] => Array ( [0] => Hello Object ( [var:Hello:private] => A [var2] => B [var3:protected] => C ) ) ) )

Note: Only four parameters are output here, namely: file, line, function, args;

For Example Two:

<code><span><span>class</span><span>Hello</span>{</span><span>private</span><span>$var</span>;
        <span>public</span><span>$var2</span>;
        <span>protected</span><span>$var3</span>;

   <span>public</span><span><span>function</span><span>__construct</span><span>(<span>$var</span>,<span>$var2</span>,<span>$var3</span>)</span>                   {</span><span>$this</span>-><span>var</span>=<span>$var</span>;
      <span>$this</span>->var2=<span>$var2</span>;
      <span>$this</span>->var3=<span>$var3</span>;
 } 

   <span><span>function</span><span>test</span><span>(Hello <span>$hello</span>)</span>{</span><span>echo</span><span>"Hi this is a test function"</span>.<span>"<br>"</span>;
       print_r(debug_backtrace());
   }
}

<span>$hello2</span>=<span>new</span> Hello(<span>'A'</span>,<span>'B'</span>,<span>'C'</span>);
<span>$hello2</span>->test(<span>$hello2</span>);
</code>

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The output result of Example Two is as follows:

Hi this is a test function
Array ( [0] => Array (
[file] => D:wwwMyProjecttestindex4.php
[line] => 54
[function] => test
[class] => Hello
[object] => Hello Object ( [var:Hello:private] => A [var2] => B [var3:protected] => C )
[type] => ->
[args] => Array ( [0] => Hello Object ( [var:Hello:private] => A [var2] => B [var3:protected] => C ) ) ) )

Note: All parameters are output here, namely: file, line, function, class, object, type, args;

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