About PHP printing formatting display tool

                                                                                                                                                                                                                                                                       

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When we debug the PHP code, we will use var_dump and print_r to output the results, and the output needs to be formatted.

Formatted result

echo "<pre class="brush:php;toolbar:false">";$arr=[3,1,5,8];
print_r($arr);

Not formatted The result after transformation

$arr=[3,1,5,8];
print_r($arr);

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