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PHP中的数据类型转换永久转换
Wuy丶
Original
496 people have browsed it
<?php
	
	//设置错误级别。E_ALL但是除了NOTICE
	error_reporting(E_ALL&~E_NOTICE);

	//永久转换
	//得到变量的类型

	$var = 123;
	
	var_dump($var);
	
	echo gettype($var);
	
	echo '<br>';
		
	$var = true;
	
	echo gettype($var);

	echo '<br>';
		
	//永久转换settype($var,$type)
	
	$var = 123;
	
	var_dump($var);
	
	//对$var做了一个手术,变成布尔类型
	settype($var,'bool');

	var_dump($var);

	/*
	 * type 的可能值为:
		“boolean” (或为“bool”,从 PHP 4.2.0 起)
		“integer” (或为“int”,从 PHP 4.2.0 起)
		“float” (只在 PHP 4.2.0 之后可以使用,对于旧版本中使用的“double”现已停用)
		"string"
		"array"
		"object"
		“null” (从 PHP 4.2.0 起)
	 * 
	 */
	
	$var = '3king';
	
	settype($var,'int');
	
	var_dump($var);

	echo '<br>';
		
	/*
	 *
	 * PHP Warning(警告):  settype(): Invalid(非法) type in I:\WWW\PHPjicurumen\type-5.php on line 56
	 * 
	 */
	
	$var = 12.3;
	
	//手术失败
	
	settype($var,'king');
	
	var_dump($var);


?>


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