Databases
StackOverflow2013
Postsdbo
POAre PHP Integer array Indexes really numeric?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAre PHP Integer array Indexes really numeric?
    primarykey
    data
    text
    <p>Consider this example</p> <pre><code>&lt;?php $test = array("00"=&gt;"A","B","C","D","E"); print_r($test); echo "&lt;br&gt;"; echo $test[0]; echo "&lt;br&gt;"; echo $test["0"]; echo "&lt;br&gt;"; echo $test["00"]; echo "&lt;br&gt;"; echo $test[00]; ?&gt; </code></pre> <p>Output</p> <blockquote> <p>Array ( [00] => A [0] => B [1] => C [2] => D [3] => E ) </p> <p>B</p> <p>B</p> <p>A</p> <p>B</p> </blockquote> <p><strong>Q1.</strong> Why is <code>$test[0]</code> same as <code>$test["0"]</code> whereas <code>$test[00]</code> is not same as <code>$test["00"]</code> </p> <p><strong>Q2.</strong> If the answer to <strong>Q1</strong> is that because <code>00 = 0</code> numerically then why does this array have one index as <code>00</code> and another as <code>0</code>?</p> <p><strong>Q3.</strong> If you cannot access <code>$test["00"]</code> using <code>$test[0]</code> then how do you know which index is numeric and which is string? if both are only numbers</p> <p><strong>Edit</strong></p> <p>Based on the answers so far, there is another question in my mind. Here goes Question 4.</p> <p><strong>Q4.</strong> Why is <code>if(00==0)</code> true and <code>if(07==7)</code> false? ( for array indexes)</p> <p><strong>Q5.</strong> </p> <pre><code>$test = array("00"=&gt;"A","0"=&gt;"B","000"=&gt;"C","0000"=&gt;"D","00000"=&gt;"E"); echo $test[0]; </code></pre> <p>Why the output is <strong>B</strong>, should it not be <strong>A</strong> ? because that is the first element in the array, at 0th position</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USHanky Panky
    1. USHanky Panky
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAre PHP Integer array Indexes really numeric?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POAre PHP Integer array Indexes really numeric?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POAre PHP Integer array Indexes really numeric?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload