学习要点

• 1.bool型转字符串
• 2.整型转字符串
• 3.浮点型转字符串
• 4.数组转字符串
• 5.资源转字符串【注意在更目录下放一个xml文件】
• 6.对象转字符串
• 7.NULL转字符串

<?php
echo '转化布尔型TRUE为字符串';
echo "<br>";
var_dump((string)TRUE);//string '1' (length=1)
echo "<br>";

echo '转化布尔型FALSE为字符串';
echo "<br>";
var_dump((string)FALSE);//string '' (length=0)
echo "<br>";

echo '转化整型为字符串';
echo "<br>";
var_dump((string)1202);//string '1202' (length=4)
echo "<br>";

echo '转化浮点数为字符串';
echo "<br>";
var_dump((string)10.27);//string '10.27' (length=5)
echo "<br>";
var_dump((string)2.3e5);//string '230000' (length=6)
echo "<br>";

echo '转化数组为字符串';
echo "<br>";
$numbers = array('1','2','3');
var_dump($numbers);
echo "<br>";
var_dump((string)$numbers);//错误
echo "<br>";

echo '转化对象为字符串';
echo "<br>";
$object = (object)"Human";
var_dump($object); //object(stdClass)[1] public 'scalar' => string 'Human' (length=5)
echo "<br>";//错误的

echo '转化资源为字符串';
echo "<br>";
//建立一个资源
$fp = fopen("peoples.xml","r");
var_dump((string)$fp); //string 'Resource id #3' (length=14)
echo "<br>";

echo '转化NULL为字符串';
echo "<br>";
var_dump((string)NULL);//string '' (length=0)

//关闭资源
fclose($fp);
?>