blocks|key|2834575|text|当你在PHP中调用一个函数(比如array_push())时，调用是有开销的，因为PHP必须查找函数引用，找到它在内存中的位置，并执行它定义的任何代码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2834576|使用$arr[]+=+'some+value';不需要函数调用，直接在数据结构中实现加法。因此，当添加大量数据时，使用$arr[]会更快、更节省资源。|2834577|entityMap^0|G|C|0|2|M|1N|6|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|R|8|@]|D|@]|E|$]]]|I|$]]

When you call a function in PHP (such as <code>array_push()</code>), there are overheads to the call, as PHP has to look up the function reference, find its position in memory and execute whatever code it defines.

Using <code>$arr[] = 'some value';</code> does not require a function call, and implements the addition straight into the data structure. Thus, when adding a lot of data it is a lot quicker and resource-efficient to use <code>$arr[]</code>.

blocks|key|2834642|text|您可以使用array_push一次向数组添加1个以上的元素，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834643|例如array_push($array_name,+$element1,+$element2,...)|offset|length|style|CODE|2834644|其中$element1，$element2，..。是要添加到数组中的元素。|2834645|但是，如果您希望一次只添加一个元素，则应首选其他方法(即使用$array_name[])。|2834646|entityMap^0|0|2|1D|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

You can add more than 1 element in one shot to array using array_push, 

e.g. <code>array_push($array_name, $element1, $element2,...)</code>

Where $element1, $element2,... are elements to be added to array.

But if you want to add only one element at one time, then other method (i.e. using $array_name[]) should be preferred.

blocks|key|199835|text|不同之处在于下面这一行“因为这样就没有调用函数的开销”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|199836|如果第一个参数不是数组，|199837|+array_push()将发出警告。这与创建新数组的$var[]行为不同。|blockquote|offset|length|style|CODE|199838|199839|entityMap^0|0|0|1|C|R|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@$G|Q|H|R|I|J]|$G|S|H|T|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

The difference is in the line below to "because in that way there is no overhead of calling a function."

<blockquote>
 <code>array_push()</code> will raise a warning if the first argument is not
 an array. This differs from the <code>$var[]</code> behaviour where a new array is
 created.
</blockquote>

blocks|key|202693|text|如果可能，您应该始终使用$array[]，因为正如框中所述，函数调用不会产生任何开销。因此，它比函数调用要快一点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|202694|entityMap^0|C|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You should always use <code>$array[]</code> if possible because as the box states there is no overhead for the function call. Thus it is a bit faster than the function call.

blocks|key|3047277|text|array_push+-将一个或多个元素推送到数组的末尾|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3047278|请注意“a+or+more+elements+the+end”这句话，要使用$arr[]执行此操作，您必须获取数组的最大大小|style|BOLD|CODE|3047279|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.array-push.php^0|0|A|0|0|4|Q|12|6|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|6|7|U|8|@$A|V|B|W|F|G]|$A|X|B|Y|F|H]]|9|@]|C|$]]|$1|I|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

<a href="http://php.net/manual/en/function.array-push.php" rel="nofollow">array_push</a> — Push one or more elements onto the end of array

Take note of the words "one or more elements onto the end"
to do that using <code>$arr[]</code> you would have to get the max size of the array

blocks|key|2834675|text|解释:1.第一个在数组中声明变量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834676|2.第二个array_push方法用于推送数组变量中的字符串。|2834677|3.最后，它将打印结果。|2834678|4.第二种方法是直接将字符串存储在数组中。|2834679|5.使用print_r方法将数据打印到数组值中。|2834680|这两个是一样的|2834681|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

explain:
1.the first one declare the variable in array.

2.the second array_push method is used to push the string in the array variable.

3.finally it will print the result.

4.the second method is directly store the string in the array.

5.the data is printed in the array values in using print_r method.

this two are same

blocks|key|2834748|text|两者是相同的，但是array_push在它的参数中生成了一个循环，该参数是一个数组并执行$array[]=$element|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834749|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

both are the same, but array_push makes a loop in it's parameter which is an array and perform $array[]=$element

blocks|key|2834729|text|我知道这是一个古老的答案，但它可能会帮助其他人知道，这两者之间的另一个区别是，如果你必须在一个数组中每个循环添加超过2/3的值，那么使用它会更快：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834730|+++++for($i+=+0;+$i+<+10;+$i%2B%2B){
++++++++++array_push($arr,+$i,+$i*2,+$i*3,+$i*4,+...)
+++++}|code-block|syntax|javascript|2834731|而不是：|2834732|+++++for($i+=+0;+$i+<+10;+$i%2B%2B){
+++++++++$arr[]+=+$i;
+++++++++$arr[]+=+$i*2;
+++++++++$arr[]+=+$i*3;
+++++++++$arr[]+=+$i*4;
+++++++++...
+++++}|2834733|编辑-忘记关闭for条件的括号|offset|length|style|CODE|2834734|entityMap^0|0|0|0|0|7|3|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I know this is an old answer but it might be helpful for others to know that another difference between the two is that if you have to add more than 2/3 values per loop to an array it's faster to use:

<pre><code> for($i = 0; $i &lt; 10; $i++){
 array_push($arr, $i, $i*2, $i*3, $i*4, ...)
 }
</code></pre>

instead of:

<pre><code> for($i = 0; $i &lt; 10; $i++){
 $arr[] = $i;
 $arr[] = $i*2;
 $arr[] = $i*3;
 $arr[] = $i*4;
 ...
 }
</code></pre>

edit- Forgot to close the bracket for the <code>for</code> conditional

blocks|key|2834764|text|没有人说过，但是array_push只把一个元素推到数组的末尾，在那里$arrayindex可以在任何给定的索引处插入一个值。差别很大。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2834765|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

No one said, but array_push only pushes a element to the END OF THE ARRAY, where $array[index] can insert a value at any given index. Big difference.

In the PHP manual, (<a href="http://php.net/manual/en/function.array-push.php" rel="noreferrer">array_push</a>) says..

<blockquote>
 If you use array_push() to add one element to the array it's better to
 use $array[] = because in that way there is no overhead of calling a
 function.
</blockquote>

For example :

<pre><code>$arr = array();
array_push($arr, "stackoverflow");
print_r($arr);
</code></pre>

vs

<pre><code>$arr[] = "stackoverflow";
print_r($arr);
</code></pre>

I don't understand why there is a big difference.

Difference between array_push() and $array[] =

数据结构

在PHP手册中，()说..如果使用array_push()将一个元素添加到数组中，最好使用$array[] =，因为这样就没有调用函数的开销。例如：$arr = array();array_push($arr, "stackoverflow");print_r($arr);vs$arr[] = "stackoverflow";print_r($arr);我不明白为什么会有这么大的不同。

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