Misma mierda que https://gist.github.com/FDSoftware/bf991ac285dff16bc569cbc95da7da98 , pero mas "limpio"

eventos2.php

<?php

//SRC: https://board.phpbuilder.com/d/10342598-quotconvert-quothoursminutesquot-to-quottotal-minutesquot-and-backquot/2
function hoursToMinutes($hours) { 
    $minutes = 0; 
    if (strpos($hours, ':') !== false) { 
        // Split hours and minutes. 
        list($hours, $minutes) = explode(':', $hours); 
    } 
    return $hours * 60 + $minutes; 
} 

function hourCompare($h1, $h2) { 
	$hora = preg_split("/[\s;]+/", $h1);
	$hora1 = preg_split("/[\s;]+/", $h2);
	$x2 = 0;
    $HA = hoursToMinutes($hora1[0]);
    $HB = hoursToMinutes($hora1[1]);
    $H1 = hoursToMinutes($hora[0]);
    $H2 = hoursToMinutes($hora[1]);
    if( $H1 > $HA and $H1 < $HB ){ //primer IF, hora inicio
        $x2++; // evento cruzado
    }else if( $H2 >= $HA and $H2 < $HB ){ //segundo IF, hora de finalizacion
        $x2++; //evento cruzado (otra ve)
    }
    
	if($x2 != 0){
		return true;
	
	}else{
		return false;
	}
}

?>