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| <?
function microtime_float() {
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
function getMot1($chaine, $n) {
$mots = explode('_', $chaine);
return $mots[$n];
}
function getMot2($chaine, $nb) {
if ($nb >= 0) {
$start = 0;
$count = 0;
while(($end = strpos($chaine, '_', $start)) !== FALSE && $count++ < $nb) {
$start = $end + 1;
}
if ($end === FALSE) {
if ($nb === $count) {
return substr($chaine, $start);
}
} else {
return substr($chaine, $start, $end - $start);
}
}
return false;
}
function getMot3($chaine, $nb) {
$start = 0;
for($i=0;$i<$nb;$i++) {
if( ($next=strpos($chaine, '_', $start)) === false ) break;
$start = $next+1;
}
$end = strpos($chaine, '_', $start);
if($end) return substr($chaine, $start, $end - $start);
return substr($chaine, $start);
}
function compare($chaine, $n) {
$loops = 10000;
echo "<h2>TEST: $chaine $n</h2>";
$start = microtime_float();
for($i=0;$i<$loops;$i++) getMot1($chaine, $n);
$dur = (microtime_float() - $start);
echo "getMot1 (explode)".$dur."<br>";
$start = microtime_float();
for($i=0;$i<$loops;$i++) getMot2($chaine, $n);
$dur = (microtime_float() - $start);
echo "getMot2 (substr 1)".$dur."<br>";
$start = microtime_float();
for($i=0;$i<$loops;$i++) getMot3($chaine, $n);
$dur = (microtime_float() - $start);
echo "getMot3 (substr 2)".$dur."<br>";
echo "<br>";
}
set_time_limit (200);
echo "<h1>Mots longs</h1>";
compare("hshdjkashjkdhaskjdasda_asdaskdhkashdjkashjkdhas_asdhasjdhasjkhdjkashd_asdaskdkashdjkhasjkdhk_asdjashjdhasjkhdjk", 0);
compare("hshdjkashjkdhaskjdasda_asdaskdhkashdjkashjkdhas_asdhasjdhasjkhdjkashd_asdaskdkashdjkhasjkdhk_asdjashjdhasjkhdjk", 1);
compare("hshdjkashjkdhaskjdasda_asdaskdhkashdjkashjkdhas_asdhasjdhasjkhdjkashd_asdaskdkashdjkhasjkdhk_asdjashjdhasjkhdjk", 2);
compare("hshdjkashjkdhaskjdasda_asdaskdhkashdjkashjkdhas_asdhasjdhasjkhdjkashd_asdaskdkashdjkhasjkdhk_asdjashjdhasjkhdjk", 3);
compare("hshdjkashjkdhaskjdasda_asdaskdhkashdjkashjkdhas_asdhasjdhasjkhdjkashd_asdaskdkashdjkhasjkdhk_asdjashjdhasjkhdjk", 4);
echo "<h1>Mots courts</h1>";
compare("a_b_c_d", 0);
compare("a_b_c_d", 1);
compare("a_b_c_d", 2);
compare("a_b_c_d", 3);
/*
var_dump(getMot3("mot0_mot1_mot2_mot3", -1));
var_dump(getMot3("mot0_mot1_mot2_mot3", 0));
var_dump(getMot3("mot0_mot1_mot2_mot3", 1));
var_dump(getMot3("mot0_mot1_mot2_mot3", 2));
var_dump(getMot3("mot0_mot1_mot2_mot3", 3));
var_dump(getMot3("mot0_mot1_mot2_mot3", 4));
*/
?> |
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