Use Section 122-A of the Red Book (see Figure 1). Perform annular capacity volume calculation, in barrels, between 5400 ft of 2 3/8 in.
There is no PHP function just to check only _if_ $needle occurs in $haystack strpos() tells you if it _doesn't_ by returning false, but, if it does occur, it tells you _where_ it occurs as an integer, which is 0 (zero) if $needle is the first part of $haystack, which is why testing if (strpos($needle, $haystack)=false) is the only way to know for sure if $needle is not part of $haystack. As Section 122, you will find also tables for multiple tubing strings inside casing. If $needle is the last character in $haystack, and testing $needle as a boolean by itself would evaluate to false, then testing strstr() as a boolean will evaluate to false (because, if successful, strstr() returns the first occurrence of $needle along with the rest of $haystack).Īlso, strstr() is far more memory-intensive than strpos(), especially with longer strings as your $haystack, so if you are not interested in the substring that strstr() returns, you shouldn't be using it anyway. Strstr() is not a way to avoid type-checking with strpos().
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