php - How can I translate "select from this variable to this variable only" into a code? -

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i have 3 variables here.

$first= 'start'; $second = 'end'; $testvar = 'start here , here until end more more more strings here';

how can search $testvar if contains start , end strings, , want post start end string only.

another way using substr() , strops()

substr($testvar,strpos($testvar,$first),strpos($testvar,$second)+3)

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