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php 中的判断 总结

<?php
/* 判断常量是否存在*/
if (defined('MYCONSTANT')) {
echo MYCONSTANT;
}
//判断变量是否存在
if (isset($myvar)) {
echo "存在变量$myvar.";
}
//判断函数是否存在
if (function_exists('imap_open')) {
echo "存在函数imag_open\n";
} else {
echo "函数imag_open不存在\n";
}
//判断类是否存在
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
//判断文件是否存在
$filename = '/path/to/foo.txt';
if (file_exists($filename)) {
echo "The file $filename exists";
} else {
echo "The file $filename does not exist";
}
//判断数组中是否存在某成员
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
echo "Got Irix";
}
//判断变量类型
is_array()
is_bool()
is_float()
is_integer()
is_null()
is_numeric()
is_object()
is_resource()
is_scalar()
is_string()
?> 


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