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Setting variable to NULL after free
... only not best practice, it's wrong. For example: foo* bar=getFoo(); /*more_code*/ free(bar); /*more_code*/ return bar != NULL;. Here, setting bar to NULL after the call to free will cause the function to think it never had a bar and return the wrong value!
– David Schwartz
...
How can I disable HREF if onclick is executed?
...ttribute:
<a href="https://example.com/no-js-login" onclick="return yes_js_login();">Log in</a>
yes_js_login = function() {
// Your code here
return false;
}
Example: https://jsfiddle.net/FXkgV/289/
...
Hidden Features of MySQL
...he SQL queries to guide MySQL to execute them faster.
Administration:
max_connections is the number of concurrent connections. The default value is 100 connections (151 since 5.0) - very small.
Note:
connections take memory and your OS might not be able to handle a lot of connections.
MySQL b...
How to return an array from JNI to Java?
...ode is going to look something like this:
JNIEXPORT jintArray JNICALL Java_ArrayTest_initIntArray(JNIEnv *env, jclass cls, int size)
{
jintArray result;
result = (*env)->NewIntArray(env, size);
if (result == NULL) {
return NULL; /* out of memory error thrown */
}
int i;
// fill a temp...
Why does the 260 character path length limit exist in Windows?
...iscussed in the following paragraphs), the maximum length for a path is MAX_PATH, which is defined as 260 characters. A local path is structured in the following order: drive letter, colon, backslash, name components separated by backslashes, and a terminating null character. For example, the maximu...
Does order of where clauses matter in SQL?
...nswered Jul 11 '12 at 15:50
marc_smarc_s
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Better way to get type of a Javascript variable?
...
If your type naming contains : or _ you may extend this regex to match(/\s([a-z,_,:,A-Z]+)/)
– masi
Jun 20 '14 at 16:58
6
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How to check what user php is running as?
...
If available you can probe the current user account with posix_geteuid and then get the user name with posix_getpwuid.
$username = posix_getpwuid(posix_geteuid())['name'];
If you are running in safe mode however (which is often the case when exec is disabled), then it's unlikely tha...
How to write log to file
...the past, but this works for me:
f, err := os.OpenFile("testlogfile", os.O_RDWR | os.O_CREATE | os.O_APPEND, 0666)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
defer f.Close()
log.SetOutput(f)
log.Println("This is a test log entry")
Based on the Go docs, os.Open() can't work f...
Mysql: Select rows from a table that are not in another
... all join conditions manually:
SELECT a.*
FROM tbl_1 a
NATURAL LEFT JOIN tbl_2 b
WHERE b.FirstName IS NULL
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