i modified the function to what it is now because it took a long time when used in a loop.
function determineIntroFromString( $string, $length=null ){
$length = ( empty( $length ) || $length < 350 ) ? 400 : $length;
$sentences = explode( ".", $string );
$intro = "";
$index = 0;
$string_length = 0;
foreach ( $sentences as $sentence ){
//echo " --- ".$sentence;
//echo strlen($sentence);exit;
if( $string_length <= $length ){
$intro .= $sentence;
$string_length = strlen( $intro );
//echo " -- ".$string_length;
unset( $sentence );
} else {
break;
}
//unset( $sentence );
}
/* while ( strlen( $intro ) <= $length ){
$intro .= $sentences[$index];
$index++;
}*/
$intro .= ".";
return $intro;
}
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