以下是一个使用empty()函数判断变量是否为空的示例: $var1 = "hello"; $var2 = ""; $var3 = 0; $var4 = null; if (empty($var1)) { echo "var1 is empty"; } else { echo "var1 is not empty"; } if (empty($var2)) { echo "var2 is empty"; } else { echo "var2 is not ...
isEmpty不能作用在null上,且a与c都是isEmpty。 PHP 代码: 1<?php2$a= '';3$b=null;4$c= 0;5Kong($a, "a");6Kong($b, "b");7Kong($c, "c");89functionKong($x,$y){1011if(empty($x)){12echo$y." isEmpty"."";13}else{14echo$y." isNotEmpty"."";15}16} 结果为: 1a i...
echo "0 is not empty;"; } if(is_null($a)){ echo "0 is null;"; }else{ echo "0 is not null;"; } if(is_numeric($a)){ echo "0 is numeric;"; }else{ echo "0 is not numeric;"; } if(is_string($a)){ echo "0 is string;"; }else{ echo "0 is not string;"; } if...
phpusePHPUnit\Framework\TestCase;classGeeksPhpunitTestCaseextendsTestCase{publicfunctiontestPositiveTestcaseForAssertNotEmpty(){ $dataHolder ='test data';// Assert function to test whether given// data holder (variable) is non-empty or not$this->assertNotEmpty( $dataHolder,"data holder is empty"...
Cannot declare class A, because the name is already in use 代码语言:javascript 代码运行次数:0 运行 AI代码解释 <?phpclassA{function__construct(){echo"第一个";}}classA{function__construct(){echo"第二个";}} 在不同的目录中新建两个一样文件名的操作是被允许的,在程序中我们也可以通过命名空间...
<?phpif($start<$end){echo"Start is before the end!\n";} 最后一个例子来演示 DatePeriod 类。它用来对循环的事件进行迭代。向它传入开始时间、结束时间和间隔区间,会得到这其中所有的事件。 <?php// output all thursdays between $start and $end$periodInterval=DateInterval::createFromDateString('first...
=openssl_encrypt($data,$algorithm,$key,0,$iv);echo $password,PHP_EOL;// 4PvOc75QkIJ184/RULdOTeO8echoopenssl_decrypt($password,$algorithm,$key,0,$iv),PHP_EOL;// 测试对称加密// Warning: openssl_encrypt(): Using an empty Initialization Vector (iv) is potentially insecure and not ...
php// array declaration$array1=array("hello","world");$array2=array();//checking whether arrays are empty or notif(empty($array1)){echo"array1 is empty";}else{echo"array1 is not empty";}if(empty($array2)){echo"array2 is empty";}else{echo"array2 is not empty";}?> Output arra...
if (is_array($filters)) //$filter: {"intval"}["intval"] 判断完成后,遍历filter的值(这里var_dump了一下,只有 array(1) {[0] = > string(6)"intval"} filter函数存在 并且debug发现data的值为1不为数组,所以进入三元运算 function array_map_recurisive() ...
The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true. The following values evaluates to empty: 0 0.0 "0" "" NULL FALSE array() ...