How to find if a variable contains certain character or not ? PHP
This question already has an answer here:
This will work:
// use strpos() because strstr() uses more resources
if(strpos("user input from search field", "-") === false)
{
// not found provides a boolean false so you NEED the ===
}
else
{
// found can mean "found at position 0", "found at position 19", etc...
}
strpos()
What NOT to do
if(!strpos("user input from search field", "-"))
The example above will screw you over because strpos() can return a 0 (zero) which is a valid string position just as it is a valid array position.
This is why it is absolutely mandatory to check for === false
简单地使用这个strstr函数：
$string= 'some string with - values ';
if(strstr($string, '-')){
echo 'symbol is isset';
}
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