PHP reorder array with starting index -

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I have an array of weeks that I want to order again by giving the starting day.

$ days_order = array ("Mon", "Mars", "Mercury", "Guru", "Venus", "Saturn", "Sun"); Echo '& lt; Pre & gt; '; Print_r ($ days_order); Echo & lt; / Pre & gt; ';

output 

  array ([0] => som [1] => Mars [2] = & gt; Mercury [3 ] = & Gt; Master [4] = & gt; Venus [5] => Saturn [6] => Sun)

Question: How to re-order array when set to start day?

Note: Index values ​​are important.

Example:

If I set day start "Mercury" , then array it Will produce: 

  array ([0] = & gt; Mercury [1] => Thurs [2] => Venus [3] => Saturn [4] = & Gt; Sun [5] = & gt; Mon [6] = & gt; Mars)

There is no array of pre-defined dates, just loop through date. 

  $ start_date = 'Mercury'; ($ I = 0; $ i & lt; 7; $ i ++) $ arr [$ i] = Date ('D', Stromathem ("Next $ start_date + $ i day"));

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