[英]bubble sort without for each php
嗨,我似乎无法使它正常工作,并且在第8行和第11行中不断出现未定义的错误。这是我的代码
<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . "<p>";
for ($incount = 0; $incount <= 7; $incount++) {
if ($name[$incount] > $name[$incount + 1]) {
$temp = $name[$incount];
$name[$incount] = $name[$incount + 1];
$name[$incount + 1] = $temp;
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . $count++ . "<p>";
}
}
?>
这是错误的:
$name[$incount] > $name[$incount + 1]
当$incount = 7
$incount +1 = 8
这对于您来说是未定义的...因为您仅定义了7个元素...
解决方案可以只是$incount < 7
您没有使用正确的算法进行冒泡排序。 它需要两个循环。
<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . "<p>";
for ($incount = 0; $incount <= 7; $incount++) {
for ($innercount = $incount+1; $innercount <= 7; $innercount++) {
if ($name[$incount] > $name[$innercount]) {
$temp = $name[$incount];
$name[$incount] = $name[$innercount];
$name[$innercount] = $temp;
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . $count++ . "<p>";
}
}
}
?>
<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . "<p>";
for ($incount = 0; $incount < 8; $incount++) {
if(isset($name[$incount + 1]))
if ($name[$incount] > $name[$incount + 1]) {
$temp = $name[$incount];
$name[$incount] = $name[$incount + 1];
$name[$incount + 1] = $temp;}
echo $name[0] . " " . $name[1] . " " . $name[2] . " " . $name[3] . " " . $name[4] . " " . $name[5] . " " . $name[6] . " " . $name[7] . $count++ . "<p>";
}
?>
但是更好的使用
<?php
$count = 0;
$temp = 0;
$name = array("Suzuki", "Holden", "Jaguar", "Toyota", "Hyundai", "Ford", "Honda", "Mazda");
foreach($name as $f) echo $f." ";
echo "<p>";
for ($incount = 0; $incount < 8; $incount++) {
if(isset($name[$incount + 1]))
if ($name[$incount] > $name[$incount + 1]) {
$temp = $name[$incount];
$name[$incount] = $name[$incount + 1];
$name[$incount + 1] = $temp;}
foreach($name as $f) echo $f." ";
echo $count++ . "<p>";
}
?>
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