trim - Delete spaces php -

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i need delete tags string , make without spaces.

i have string 

"<span class="left_corner"> </span><span class="text">adv</span><span class="right_corner"> </span>"

after using strip_tags string

" adv "

using trim function can`t delete spaces.

json string looks "\u00a0...\u00a0".

help me please delete spaces.

solution of problem

$str = trim($str, chr(0xc2).chr(0xa0))


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