[英]Dumping many variables in PHP
I assure this is a very common situation when you have to test variables (and they are many!), just like this example (I only named vars like this for less-effort-writing sake): 我保证当您必须测试变量时(这是很多!),这是一个非常普遍的情况,就像下面的示例一样(为方便起见,我只这样命名vars):
$variable0='red';
$variable1='blue';
$variable2='green';
$variable3='pink';
$variable4='purple';
$variable5='hellow';
$variable6='foo';
$variable7='bar';
$variable8='hi';
$variable9='bye';
echo
'$variable0='.$variable0.'<br>
$variable1='.$variable1.'<br>
$variable2='.$variable2.'<br>
$variable3='.$variable3.'<br>
$variable4='.$variable4.'<br>
$variable5='.$variable5.'<br>
$variable6='.$variable6.'<br>
$variable7='.$variable7.'<br>
$variable8='.$variable8.'<br>
$variable9='.$variable9;
My question is: is there a better way to make this echoing / dumping / printing easier? 我的问题是:是否有更好的方法使回显/转储/打印更容易?
Of course, there are other ways of doing the very same presidiary work: 当然,还有其他方法可以完成相同的常规工作:
$x=
'$variable0='."$variable0\n".
'$variable1='."$variable1\n".
'$variable2='."$variable2\n".
'$variable3='."$variable3\n".
'$variable4='."$variable4\n".
'$variable5='."$variable5\n".
'$variable6='."$variable6\n".
'$variable7='."$variable7\n".
'$variable8='."$variable8\n".
'$variable9='."$variable9"
echo nl2br($x);
Or: 要么:
$x=<<<HEREDOC
\$variable1=$variable1
\$variable2=$variable2
\$variable3=$variable3
\$variable4=$variable4
\$variable5=$variable5
\$variable6=$variable6
\$variable7=$variable7
\$variable8=$variable8
\$variable9=$variable9;
HEREDOC;
echo nl2br($x);
But maybe PHP has a function to make this easier? 但是,也许PHP具有使此操作更容易的功能?
By the way, all 3 solutions above echoes the very same: 顺便说一句,以上所有3个解决方案都是相同的:
$variable1=blue<br>
$variable2=green<br>
$variable3=pink<br>
$variable4=purple<br>
$variable5=hellow<br>
$variable6=foo<br>
$variable7=bar<br>
$variable8=hi<br>
$variable9=bye;
Introducing compact
: compact
介绍:
var_dump(compact('foo', 'bar', 'baz'));
Note though that I explicitly used three very different variables: $foo
, $bar
and $baz
. 请注意,尽管我明确使用了三个非常不同的变量:
$foo
, $bar
和$baz
。
If you actually do literally have $foo1
, $foo2
etc, you're really really looking to use an array instead. 如果您确实确实有
$foo1
, $foo2
等,那么您实际上是在寻找使用数组。 Dumping that would be trivial too: 倾销也将是微不足道的:
$foo = array();
$foo[0] = 'bar';
$foo[1] = 'baz';
var_dump($foo);
In general, if you have too many variables floating around, your scope is probably too big and you should refactor everything into a number of smaller functions, or your algorithm is more complex than it needs to be, or you should be using arrays or other data structures instead. 通常,如果周围有太多变量,则范围可能太大,应将所有内容重构为多个较小的函数,或者算法比所需的复杂,或者应使用数组或其他数据结构。
get_defined_vars()
would be able to do so. get_defined_vars()
可以做到这一点。 Might be overkill ( all accessable vars will be shown): 可能过大(将显示所有可访问的变量):
print_r( get_defined_vars() );
Return Values: A multidimensional array with all the defined variables*. 返回值:具有所有已定义变量*的多维数组。
*In a function it will only show the local $vars, and those defined as global. *在一个函数中,它将仅显示本地$ vars和定义为global的$ vars。
Note: This does exactly what you're looking for, but the array methods mentioned in other answers would be a better fit logical-wise, see below: 注意:这正是您要寻找的,但是其他答案中提到的数组方法将更符合逻辑,请参见下文:
A better way for you to set the values is with an array, this way you 'group' multiple values together: 设置值的更好方法是使用数组,这样可以将多个值“分组”在一起:
$color[] = 'red'; // will automatically start with key=0
$color[] = 'blue'; // key=1
$color[] = 'green';// key=2 etc
print_r( $color );
echo $color[1]; // Blue, same as your echo $variable1;
You can declare your variables as keys from an array instead 您可以改为将变量声明为数组中的键
$myarray=Array();
$myarray['variable0']='red';
$myarray['variable1']='blue';
$myarray['variable2']='green';
$myarray['variable3']='pink';
$myarray['variable4']='purple';
$myarray['variable5']='hellow';
$myarray['variable6']='foo';
$myarray['variable7']='bar';
$myarray['variable8']='hi';
$myarray['variable9']='bye';
and print them all with 并用它们全部打印
echo '<pre>';
print_r($myarray);
echo '</pre>';
then, in case you still need to use them as separate variables, doing 然后,如果您仍然需要将它们用作单独的变量,请执行
extract($myarray)
will create $variable0 to $variable9 in the global context. 将在全局上下文中创建$ variable0到$ variable9。
如果您知道上限和下限,并且所有变量都具有相似的名称,则可以执行以下操作:
for ($i = 0; $i < $end; ++$i) { echo ${'value_name'. $i}; }
This should give you the output your looking for: 这应该为您提供所需的输出:
function get_var_name($var) {
foreach($GLOBALS as $var_name => $value) {
if ($value === $var) {
return $var_name;
}
}
return "Variable name not found";
}
function miracle_var_dump($valuesToDump) {
//For each variable in the $valuesToDump array, print the name and value
for($i = 0; $i < count($valuesToDump); $i++) {
echo(get_var_name($valuesToDump[i]) . "=" . $valuesToDump[i] . "<br/>");
}
}
//Making a call to dump the variables
miracle_var_dump(array($variable0,$variable1,$variable2,$variable3,$variable4,$variable5,$variable6,$variable7,$variable8,$variable9))
Function get_var_name gets the variable name given the variable (taken from one of Jeremey Rutins awsners ). 函数get_var_name获取给定变量的变量名(取自Jeremey Rutins awsners之一 )。
//let your variables like this
$variable0='red';
$variable1='blue';
$variable2='green';
//an array to keep all the variable names
$var_names=array();
$var_names[]='$variable0';
$var_names[]='$variable1';
$var_names[]='$variable2';
//etc...
print_var_name($var_names);
function print_var_name($var_names) {
//loop through the array and dump them if they are in $GLOBALS
foreach($GLOBALS as $var_name => $value) {
if (in_array('$'.$var_name,$var_names)) {
echo $var_name;
var_dump($value);
}
}
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