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copied!<p>Probably the most straightforward way</p> <pre><code>array_unshift( $arr, array_pop( $arr ) ); </code></pre> <h2>EDIT</h2> <p>Per your comment "how can I take any one subscript from the array and move it to the beginning", my answer above doesn't fully satisfy that request - it <em>only</em> works by moving the last element to the 0 index.</p> <p>This function, however, does satisfy that request</p> <pre><code>/** * Move array element by index. Only works with zero-based, * contiguously-indexed arrays * * @param array $array * @param integer $from Use NULL when you want to move the last element * @param integer $to New index for moved element. Use NULL to push * * @throws Exception * * @return array Newly re-ordered array */ function moveValueByIndex( array $array, $from=null, $to=null ) { if ( null === $from ) { $from = count( $array ) - 1; } if ( !isset( $array[$from] ) ) { throw new Exception( "Offset $from does not exist" ); } if ( array_keys( $array ) != range( 0, count( $array ) - 1 ) ) { throw new Exception( "Invalid array keys" ); } $value = $array[$from]; unset( $array[$from] ); if ( null === $to ) { array_push( $array, $value ); } else { $tail = array_splice( $array, $to ); array_push( $array, $value ); $array = array_merge( $array, $tail ); } return $array; } </code></pre> <p>And, in usage</p> <pre><code>$arr = array( 'red', 'green', 'blue', 'yellow' ); echo implode( ',', $arr ); // red,green,blue,yellow // Move 'blue' to the beginning $arr = moveValueByIndex( $arr, 2, 0 ); echo implode( ',', $arr ); // blue,red,green,yellow </code></pre>

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