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PHP Regarding the judgment results of empty and isset on parameters, emptyisset_PHP tutorial

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2016-07-12 09:05:03777browse

PHP Regarding the judgment results of empty and isset for parameters, emptyisset

<?php
	class test{}
	$a1 = null;
	$a2 = "";
	//$a3 = 
	$a4 = 0;
	$a5 = '0';
	$a6 = false;
	$a7 = array();
	//var $a8;
	$a9 = new test();

	for ($i=1; $i <=9 ; $i++) { 
		$s = 'a'.$i;
		echo $i . ":";
		var_dump(isset($$s));
		echo '<br />';

	}
	echo '<br />';
	for ($i=1; $i <=9 ; $i++) { 
		$s = 'a'.$i;
		echo $i . ":";
		var_dump(empty($$s));
		echo '<br />';
	}

 

That’s basically it

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